Lua function for geting a surface cframe and size that is aligned to a surface gui

GetSurfaceCFrame.lua

local UNIT_X = Vector3.new(1, 0, 0)
local UNIT_Y = Vector3.new(0, 1, 0)
local SPIN_Y = CFrame.fromEulerAnglesXYZ(0, -math.pi/2, 0)

local function getRotationBetween(u, v, axis)
	local dot, uxv = u:Dot(v), u:Cross(v)
	if dot < -0.99999 then return CFrame.fromAxisAngle(axis, math.pi) end
	return CFrame.new(0, 0, 0, uxv.x, uxv.y, uxv.z, 1 + dot)
end

local function getSurfaceCFrame(part, enum)
	local pSize = part.Size
	local lnormal = Vector3.FromNormalId(enum)
	local lrotation = getRotationBetween(UNIT_X, lnormal, UNIT_Y) * SPIN_Y
	local components = {lrotation:GetComponents()}
	
	for i = 4, 12 do
		components[i] = math.floor(components[i] + 0.5)
	end
	lrotation = CFrame.new(unpack(components))
	
	local size = Vector3.new(
		math.abs(lrotation.XVector:Dot(pSize)),
		math.abs(lrotation.YVector:Dot(pSize)),
		math.abs(lrotation.ZVector:Dot(pSize))
	)
	
	return part.CFrame * CFrame.new(lnormal * pSize/2) * lrotation, size
end