NixOS configuration for my laptop

configuration.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, lib, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
      ./musnix
    ];

fonts.fonts = [ pkgs.open-dyslexic ];

#musnix = {
#  enable = true;
#  alsaSeq.enable = true;
#  soundcardPciId = "00:1b.0";
#  rtirq.enable = true;
#  kernel = {
#    realtime = true;
#    optimize = true;
#  };
#};  
boot = {
  initrd.luks.devices."cryptroot" = {
    keyFile = "/dev/sdb"; 
    keyFileSize = 4096;
  };
  loader = {
    grub = {
    enable = true;
    version = 2;
  # Define on which hard drive you want to install Grub.
    device = "/dev/sda";
    };
  };
  plymouth = { 
    # enable = true;
    # theme = breeze-plymouth;
    themePackages = with pkgs; [ plasma5.breeze-plymouth ];
  };
};

  swapDevices = [ { device = "/swapfile"; size = 4096; } ];

  networking = {
    hostName = "nixlaptop";
    wireless.enable = false;
    useDHCP = false;
    networkmanager.enable = true;
    #wicd.enable = true;
    # proxy.default = "http://127.0.0.1:8118";
  };

  # Select internationalisation properties.
  i18n = {
    consoleFont = "Lat2-Terminus16";
    consoleKeyMap = "uk";
    defaultLocale = "en_GB.UTF-8";
  };

  # Set your time zone.
  time.timeZone = "Europe/London";

  # List services that you want to enable:

services = {  
    # Enable the OpenSSH daemon.
  openssh = {
    enable = true;
    startWhenNeeded = true;
    passwordAuthentication = false;
  };
  # Enable CUPS to print documents.


  # Enable the X11 windowing system.
  xserver = {
    enable = true;
    layout = "uk";
    #displayManager.slim.enable = true;
    #desktopManager.xfce.enable = true;
    displayManager.sddm.enable = true;
    desktopManager.plasma5.enable = true;
    windowManager.exwm.enable = true;
    synaptics.enable = true;
    videoDrivers = [ "intel" ];
  };
  # Syncthing service config

  syncthing = {
        enable = true;
	useInotify = true;
	all_proxy = null;
        dataDir = "/home/eddie/.syncthing";
        user = "eddie";
  };
  
  ## DNSCrypt + DNSMasq
  
  dnscrypt-proxy = {
    enable = true;
    localPort = 43;
  };
  dnsmasq = {
    enable = true;
    servers = [ "127.0.0.1#43" ];
  };
  
  ## Tor + Privoxy
  
  privoxy.enable = true;
  tor = {
    enable = true;
    client = {
    	enable = true;
    	privoxy.enable = true;
    };
    tsocks.enable = true;
  };

  # Redshift
  
  redshift = {
        enable = true;
        latitude = "53.5615";
        longitude = ".3268";
  };
  tlp.enable = true;
  udisks2.enable = true;
  printing.enable = true;
};

  security.apparmor.enable = true;
system = {
  autoUpgrade.enable = true;
  stateVersion = "17.03";
};

hardware = {
  opengl = {
    enable = true;
    };
  pulseaudio = {
    enable = true;
    package = pkgs.pulseaudioFull;
  };
};
  # Define a user account. Don't forget to set a password with ‘passwd’.
users.extraUsers = {
  eddie = {
    isNormalUser = true;
    extraGroups = [ "networkmanager" "audio" "wheel" ];
  };
  dave = {
    isNormalUser = true;
    extraGroups = [ "networkmanager" "wheel" "audio" ];
  };
};
  
nixpkgs.config = {
  allowUnfree = true;
  allowBroken = true;
};
  # system packages
environment.systemPackages = with pkgs; with qt5; with libsForQt5; with plasma5; with kdeApplications; [
    
    # general desktop stuff
  firefox claws-mail qutebrowser midori
  xscreensaver 

  # music stuff
  guitarix qjackctl jack2Full
  # themes
  theme-vertex numix-gtk-theme
  tango-icon-theme numix-icon-theme numix-icon-theme-circle 
]
++builtins.filter lib.isDerivation (builtins.attrValues pkgs.plasma5)
++builtins.filter lib.isDerivation (builtins.attrValues pkgs.kdeApplications);

}

What does 182 and 183 accomplish? I've been trying to add all linux kernel module packages as systempackages in some way (since some bundle userspace tools) w/o any success. Functional programming (and Nix) is hard!