Shed design. Open in OpenScad to view 3d model.

shed.scad

windows = false;  // show windows
stuff = false; // Show bikes, table, mower

l = 32; // Length of building in feet (16, 20, 24, 28, 32, ...)
h = 8*12-4.5+.5;
rl=6*12+1.375+.1; // cut to 73.5" long with 22.5 degree angles
tl = 68.7; // Used to tweak headers on top walls

// 2x6 concrete forms for foundation
// 10" wide grid
// rebarb reinforced. 3/8

module Foundation() {
  color([.9,.9,.9]) {
      cube([16*12,l*12,12]);
  }
}

module FloorRafters(ll) {
  color([.95,.8,.6]) {
    translate([0, 0, 0])
      cube([16*12, 1.5, 9.5]);
    for (i = [1:ll*12/24-1]) {
      translate([1.5, 24 * i - .75, 0])
        cube([16*12-3, 1.5, 9.5]);
    }
    translate([0, ll*12-1.5, 0])
      cube([16*12, 1.5, 9.5]);
    translate([0, 1.5, 0])
      cube([1.5, ll*12-3, 9.5]);
    translate([16*12-1.5,1.5,0])
      cube([1.5,ll*12-3,9.5]);
  }
};

module LowerSubfloor() color([.9, .8, .7]) {
  for (x = [0:4:16-4]) {
    for (y = [0:8:l-8]) {
      if (x % 8 == 0) {
        translate([x*12,y*12,0])
          cube([4*12, 8*12, .703]);
      }
      else {
        if (y <= l - 12) {
          translate([x*12,(y+4)*12,0])
            cube([4*12, 8*12, .703]);
        }
        else {
          translate([x*12,(y+4)*12,0])
            cube([4*12, 4*12, .703]);
          translate([x*12,0,0])
            cube([4*12, 4*12, .703]);
        }
      }
    }
  }
}  
module UpperSubFloor() color([.9, .8, .7]) {
  for (x = [0:4:16-4]) {
    for (y = [0:8:l-8]) {
      difference() {
        if (x % 8 == 0) {
          translate([x*12,y*12,0])
            cube([4*12, 8*12, .703]);
        }
        else {
          if (y <= l - 12) {
            translate([x*12,(y+4)*12,0])
              cube([4*12, 8*12, .703]);
          }
          else {
            translate([x*12,(y+4)*12,0])
              cube([4*12, 4*12, .703]);
            translate([x*12,0,0])
              cube([4*12, 4*12, .703]);
          }
        }
        translate([5.5,5.5,-.01]) {
          cube([119.5-11.5,48,3]);
          cube([48,113.75,3]);
        }
      }
    }
  }
}

module SideWall(w, ll, ac, e) {
  
  // Window
  if (windows && w) %translate([-1, w*24+.75+1.5, 34+12])
    cube([5, 36, 36]);

  // Air conditioner.
  if (windows && ac) %translate([-1, ac*24+.75+1.5, 64])
    cube([23, 23+7/8, 18]);
  
  // Bottom Plate
  cube([5.5,ll*12,1.5]);

  // Top Double Plate
  translate([0, 0, h+1.5])
    cube([5.5, ll*12, 1.5]);
  if (e) {
    translate([0, 5.5, h+3])
      cube([5.5, ll*12, 1.5]);
  }
  else {
    translate([0, 5.5, h + 3])
      cube([5.5, ll*12-11, 1.5]);
  }


  // Studs
  translate([0,0,1.5])
    cube([5.5, 1.5, h]);
  if (e)  translate([0,5.5,1.5])
    cube([5.5, 1.5, h]);
  
  if (w) {
    
    if (w >= 1) for (i = [1:w]) {
      if (i != ac + 1)
      translate([0,24*i-.75,1.5])
        cube([5.5, 1.5, h]);
    }
    
    translate([0, w*24, 0])
      lowerWindow();
    
    if (ll*12/24-1 >= w + 2) for (i = [w+2:ll*12/24-1]) {
      if (i != ac)
      translate([0,i*24-.75,1.5])
        cube([5.5, 1.5, h]);
    }
  }
  else for (i = [1:ll*12/24-1]) {
    if (i!= ac + 1)
    translate([0,24*i-.75,1.5])
      cube([5.5, 1.5, h]);
  }
  if (ac) translate([0, ac*24, 0])
    ac();


  // Corner studs
  translate([0,ll*12-1.5, 1.5])
    cube([5.5, 1.5, h]);
  if (!e) translate([0,ll*12-7, 1.5])
    cube([5.5, 1.5, h]);

}

module UpperFloor() color([.95,.8,.6]) {
  // First
  cube([16*12, 1.5, 9.5]);
  
  // Short
  for (i = [1:2]) {
    translate([126.5, 24 * i - .75, 0])
      cube([64, 1.5, 9.5]);
  }

  // Medium
  for (i = [3:4]) {
    translate([55, 24 * i - .75, 0])
      cube([135.5, 1.5, 9.5]);
  }
  
  // Full width 
  for (i = [5:7]) {
    translate([1.5, 24 * i - .75, 0])
      cube([16*12-3, 1.5, 9.5]);
  }
  
  // Last
  translate([0, 16*12-1.5, 0])
    cube([16*12, 1.5, 9.5]);
  
  translate([5.5+48,53.5, 0]) // Medium cap
    cube([1.5, 41.75+24, 9.5]);
  translate([55,55-1.5, 0]) // med-to-small
    cube([70.25, 1.5, 9.5]);
  translate([125,1.5, 0]) // small cap
    cube([1.5, 69.75, 9.5]);
  translate([5.5,4, 0])
    cube([119.75, 1.5, 9.5]);
  translate([4, 1.5, 0])
    cube([1.5, 93.75+24, 9.5]);
  
  // Edges
  translate([0,1.5, 0])
    cube([1.5, 16*12-3, 9.5]);
  translate([12*16-1.5,1.5, 0])
    cube([1.5, 16*12-3, 9.5]);
  
}


module Back() {
  // Bottom Plate
  translate([5.5,0,0])
    cube([16*12-11,5.5,1.5]);
     
  // Back Wall
  translate([5.5,0,1.5])
    cube([1.5, 5.5, h]);
  for (i = [1:7]) {
    translate([24*i-.75,0,1.5])
      cube([1.5, 5.5, h]);
  }
  translate([16*12-5.5-1.5,0,1.5])
    cube([1.5, 5.5, h]);

  // Top double plate
  translate([5.5,0,h + 1.5])
    cube([16*12-11,5.5,1.5]);
  translate([0,0,h + 3])
    cube([16*12,5.5,1.5]);
        
}



module lowerWindow() {
  translate([0,.75,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);

  translate([0,.75,82]) // Header 0
    cube([5.5, 36+3, 1.5]);
  translate([0,.75,83.5]) // Header 1
    cube([5.5, 36+3, 1.5]);
  translate([0,2.25,32.5+12]) // Sill
    cube([5.5, 36, 1.5]);
  translate([0,24-.75,85]) // Upper Cripple
    cube([5.5, 1.5, h-83.5]);
  translate([0,24-.75,1.5]) // Lower Cripple
    cube([5.5, 1.5, 34-3+12]);
  translate([0,36+2.25,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);
  translate([0,36++3.75,1.5]) // King Stud
    cube([5.5, 1.5, h]);
}
module ac() {
  translate([0,.75,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);
  translate([0,.75,82]) // Header 0
    cube([5.5, 23+7/8+3, 1.5]);
  translate([0,.75,83.5]) // Header 0
    cube([5.5, 23+7/8+3, 1.5]);
  translate([0,2.25,62.5]) // Sill
    cube([5.5, 23+7/8, 1.5]);
  translate([0,24-.75,85]) // Upper Cripple
    cube([5.5, 1.5, h-83.5]);
  translate([0,24-.75,1.5]) // Lower Cripple
    cube([5.5, 1.5, 61]);
  
  translate([0,23+7/8+.75+1.5,1.5]) // Jack Stud
    cube([5.5, 1.5, 80.5]);
  translate([0,23+7/8+.75+3,1.5]) // King Stud
    cube([5.5, 1.5, h]);

}


module Front() {
 
  // Big Door
  if (windows) %translate([58.5,-1,0])
    cube([75,7,83.5]);

  // Bottom Plate
  translate([5.5,0,0])
    cube([60-5.5-1.5,5.5,1.5]);
  translate([133.5,0,0])
    cube([60-5.5-1.5,5.5,1.5]);

  // Studs and Frames
  translate([5.5,0,1.5])
    cube([1.5, 5.5, h]);
  translate([24-.75,0,1.5])
    cube([1.5, 5.5, h]);
  translate([48-.75,0,1.5])
    cube([1.5, 5.5, h]);
  translate([60-4.5,0,1.5]) // King Stud
    cube([1.5, 5.5, h]);
  translate([60-3,0,1.5]) // Jack Stud
    cube([1.5, 5.5, 82]);
  translate([60-3,0, 83.5]) // header 0
    cube([78, 5.5, 1.5]);
  translate([60-3,0, 85]) // header 1
    cube([78, 5.5, 1.5]);
  for (i = [3:5]) { // Cripples
    translate([24*i-.75,0, 90.5-4])
      cube([1.5, 5.5, h-89+4]);
  }
  translate([133.5,0,1.5]) // Jack Stud
    cube([1.5, 5.5, 82]);
  translate([132+3,0,1.5]) // King Stud
    cube([1.5, 5.5, h]);
  translate([144-.75,0,1.5])
    cube([1.5, 5.5, h]);
  translate([168-.75,0,1.5])
    cube([1.5, 5.5, h]);
  
  translate([192-7,0,1.5])
    cube([1.5, 5.5, h]);
  
  // Top Double Plate
  translate([5.5, 0, h + 1.5])
    cube([181,5.5,1.5]);
  translate([0, 0, h + 3])
    cube([192,5.5,1.5]);
}

module TopWall() {
  if (windows) %translate([72,-1,24])
    cube([48,5,48]);
  
  // Base plate
  translate([5.5,0,0])
    cube([16*12-11,5.5,1.5]);
  
  // Top Plate
  t = .5;
  s = 5.7;
  translate([s, 0, t])
    rotate([0,22.5,0])
      cube([1.5,5.5,tl]);
  translate([s + sin(22.5)*tl, 0, t+cos(22.5)*tl])
    rotate([0,67.5,0])
      cube([1.5,5.5,tl]);
  
  translate([16*12,0,0]) mirror([1,0,0]) {
    translate([s, 0, t])
      rotate([0,22.5,0])
        cube([1.5,5.5,tl]);
    translate([s + sin(22.5)*tl, 0, t+cos(22.5)*tl])
      rotate([0,67.5,0])
        cube([1.5,5.5,tl]);
  }

  translate([24-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
  translate([48-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
  translate([72-3,0, 1.5]) // King Stud
    cube([1.5, 5.5, 8*12]);
  translate([72-1.5,0, 1.5]) // Jack Stud
    cube([1.5, 5.5, 6*12-1.5]);
  translate([72-1.5,0, 73.5]) // Header 1
    cube([48+3, 5.5, 1.5]);
  translate([72-1.5,0, 72]) // Header 2
    cube([48+3, 5.5, 1.5]);
  translate([72-1.5,0, 22.5]) // Sill 1
    cube([48+3, 5.5, 1.5]);
  translate([96-.75,0, 75]) // Cripple Top
    cube([1.5, 5.5, 2*12]);
  translate([96-.75-24,0, 75]) // Cripple Top
    cube([1.5, 5.5, 2*12]);
  translate([96-.75+24,0, 75]) // Cripple Top
    cube([1.5, 5.5, 2*12]);
  translate([96-.75,0, 1.5]) // Cripple Bottom
    cube([1.5, 5.5, 24-3]);
  translate([120,0, 1.5]) // Jack Stud
    cube([1.5, 5.5, 6*12-1.5]);
  translate([120+1.5,0, 1.5]) // Jack Stud
    cube([1.5, 5.5, 8*12]); // King Stud
  translate([144-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
  translate([168-.75,0, 1.5])
    cube([1.5, 5.5, 8*12]);
}
module Inner() {

  // Lower wall
  translate([5.5+48, 53.5,0]) // base plate
    cube([5.5, 43.25+24, 1.5]);
  for (i = [3:5]) {
    translate([5.5+48, i*24-.75,1.5])
      cube([5.5, 1.5, h]);
  }
  // Inner ends
  translate([5.5+48, 53.5,1.5])
    cube([5.5, 1.5, h]);
  translate([5.5+48, 59,1.5])
    cube([5.5, 1.5, h]);
  //top plates
  translate([5.5+48, 53.5, h + 1.5])
    cube([5.5, 43.25+24, 1.5]);
  translate([5.5+48, 59, h + 3])
    cube([5.5, 37.75+24, 1.5]);
  
  // Mid wall
  translate([59, 53.5,0]) // base plate
    cube([67.5, 5.5, 1.5]);
  // Top plates
  translate([59, 53.5, h + 1.5])
    cube([67.5, 5.5, 1.5]);
  translate([53.5, 53.5, h + 3])
    cube([73, 5.5, 1.5]);
  translate([59, 53.5, 1.5]) // inner end
    cube([1.5, 5.5, h]);
  for (i = [3:5]) {
    translate([i*24-.75, 53.5, 1.5])
      cube([1.5, 5.5, h]);
  translate([125, 53.5, 1.5]) // outer end
    cube([1.5, 5.5, h]);
  }

}
module Steps() {

  for (i = [0:6]) {
    translate([0, 10*i-1.5, 7.5*i+6])
      cube([48,11.5,1.5]);
    translate([0, 10*i-1.5, 7.5*i])
      cube([48,1.5,6]);
  }
  
  difference() {
    translate([.01, -2.85, 3.85])
      rotate([-53,0,0])
        union() {
          cube([1.5,11.5,8*12]);
          translate([24-.75,0,0])
            cube([1.5,11.5,8*12]);
          translate([48-1.5,0,0])
            cube([1.5,11.5,8*12]);
        }
    for (i = [0:6]) {
      translate([-1, 10*i-1.51, 7.5*i+6-.01])
        cube([50,11.5,10]);
      translate([-1, 10*i-10.01, 7.5*i-.01])
        cube([50,10,6]);
    }
    translate([-1, 10*7-.02, 7.5*6-10])
      cube([50,30,30]);
    translate([-1, -1, -30.0])
      cube([50,30,30.01]);
  }
  
}  

module Stairs() {
    /*
Stairs
rise 105"
run 140"

14 risers (including top floor)
7.5" rise for each
run 10"
headroom opening for all but bottom 2 steps
4' wide (3 stringers at 16" centers, 2"x12"x16')

*/
  translate([0,0,1.5]) {
    translate([5.5+48,123.5,0])
      rotate([0,0,180]) {
        translate([0,-1.5,-1.5]) cube([48, 11.5,1.5]);
        Steps();
      }
    translate([5.5,5.5,105/2-9]) {
      translate([0,0,0])
        cube([60, 1.5, 7.5]);
      translate([0,48-1.5,0])
        cube([60, 1.5, 7.5]);
      translate([1.5,48-.75-24,0])
        cube([60-3, 1.5, 7.5]);
      translate([0,1.5,0])
        cube([1.5, 48-3, 7.5]);
      translate([60-1.5,1.5,0])
        cube([1.5, 48-3, 7.5]);
      for (i = [0:7]) {
        translate([7.5*i,0,7.5])
          cube([7.5,48,1.5]);
      }
    }
    translate([5.5+48+1.5, 5.5+48, 105/2])
      rotate([0,0,-90])
        Steps();
  }
}

module Top() {
  
  // Walls clipped to rafter shape
  r = 8*12-5.5;
  intersection() {
    translate([8*12,(l+.5) *12,0])
      rotate([90,0,0])
        cylinder(h=(l+1)*12, r1=r,r2=r,$fn=8);
    union() {
      TopWall();
      translate([0,l*12-3.5,0]) TopWall();
    }
  }
}

module Rafter() {
  translate([0, 0, 0])
    rotate([0,22.5,0])
      cube([5.5, 1.5, rl]);
  translate([sin(22.5)*rl, 0, cos(22.5)*rl])
    rotate([0,67.5,0])
      cube([5.5, 1.5, rl]);
  translate([16*12,0,0]) mirror([1,0,0]) {
    translate([0, 0, 0])
      rotate([0,22.5,0])
        cube([5.5, 1.5, rl]);
    translate([sin(22.5)*rl, 0, cos(22.5)*rl])
      rotate([0,67.5,0])
        cube([5.5, 1.5, rl]);
  }
}


module Rafters() {
  // Base Plates
  cube([5.5,l*12,1.5]);
  translate([16*12-5.5,0,0])
    cube([5.5,l*12,1.5]);

  Rafter();
  translate([0, 5.5, 0])
    Rafter();
  for (i = [1:l*12/24-1]) {
    translate([0, 24*i-.75, 0])
      Rafter();
  }
  translate([0, l*12-7, 0])
    Rafter();
  translate([0, l*12-1.5, 0])
    Rafter();
}
module long() {
  cube([1.5,16*12,5.5]);
  translate([0,16*12,0])
    cube([1.5,16*12,5.5]);
}


translate([0,0,-12]) Foundation();

// Lower Walls
translate([16*12-5.5,0,0]) SideWall(false, 16, 3, true);
translate([16*12-5.5,16*12,0]) SideWall(1, 16);
SideWall(5, 16, false, true);
translate([0,16*12,0]) SideWall(false, 16);
Back();
translate([0,l*12-5.5]) Front();

Inner();
Stairs();

translate([0,0,h+4.5]) UpperFloor();
translate([0,16*12,h+4.5]) FloorRafters(l-16);
translate([0,0,h+4.5+9.5]) UpperSubFloor();


translate([0,0,97.125 + 7.5]) {
 Top();
 Rafters();
 RoofSheathing();
}

if (stuff) {
  // Lawn Mower
  %translate([(16-6)*12,(l-6)*12,1])
    cube([5*12,5*12,5*12]);
    
  // Work Table
  %translate([11.5*12,7*12,1])
    cube([4*12,8*12,3*12]);

  // Tim Fat Bike
  %translate([5,l*12-30-5,12])
    cube([46,30,76]);

  // Tim Mission Bike
  %translate([5,l*12-56-5,21])
    cube([46,25,67]);

  // Mir Bike
  %translate([5,l*12-82-5,22])
    cube([44,25,66]);

  // Charlotte Trailer
  %translate([5,l*12-101,34])
    cube([30, 13, 54]);

  // Green Trailer  
  %translate([5,l*12-125,10])
    cube([25,23,38]);

  // Green Trailer
  %translate([5,l*12-125,50])
    cube([25,23,38]);
    
  // Double Trailer
  %translate([16*12-5-20,l*12-105,48])
    cube([20, 30,40]);


    
}

I decided to go with a slab for the foundation. It only costs $500 more and saves around $800 in lumber (not to mention a lot of labor) and the end product is better.

The guys doing the slab will need to know where to put anchor bolts, this will help:

Tweaked window and door openings for new sizes and so that studs line up more often. Also removed perlins and will be putting foil lined sheathing on top instead.

Pro-tip. The foil lined sheathing really helps with cooling costs, but it destroys cell reception inside the building by making it a giant Faraday cage.

Nice! Thanks for sharing! I'm looking to build a paid of smaller sheds and am starting with design in OpenSCAD. Being new to OpenSCAD, what you've shared in this gist will be tremendously helpful. It's a great example of a way to get the design done. I'll make sure to share my design and pics too!