This Union Mini Map Script Won't Work properly?

So, I got the script to make maps small with unions, but it doesn't minimap it correctly with the unions. For example, I made a gun out of unions I placed together, and after minimaping it with my script it came out all over the place. Any help in how to fix it? Thanks.

scale = 1 / 2

local representation = Instance.new("Model")
representation.Parent = game.Workspace
representation.archivable = true
representation.Name = "Model"
local unions = {}

function DefineForUnion() -- 
local things = game.Workspace:GetChildren()
    print("Found things...")
	for i , v in pairs (things) do
        if v.className == "UnionOperation" then
            table.insert(unions,v)
			print("Inserted unions to table...")
        end
    end
end
DefineForUnion()



function makeRepresentation(obj, cf, name)
	
	if not obj.archivable then
		return 
	end
	for i, union in pairs (unions) do 
		print("Found the unions...")
		if (union.className == "UnionOperation") then
			local new = union:Clone()			
			new.Size = union.Size * scale
			new.Parent = game.Workspace
			new.CFrame = CFrame.new(0,10,0)
		end
	end	
	if ((obj.className == "Part") or (obj.className == "Seat") or (obj.className == "SpawnLocation") or (obj.className == "WedgePart") or (obj.className == "TrussPart") or (obj.className == "VehicleSeat")) then 
		local rep = Instance.new("Part")
		rep.Size = obj.Size * scale
		rep.Transparency = obj.Transparency
		rep.Reflectance = obj.Reflectance
		rep.BrickColor = obj.brickColor
		rep.Anchored = true
		rep.Locked = false
		rep.TopSurface = Enum.SurfaceType.Smooth
		rep.BottomSurface = Enum.SurfaceType.Smooth
		
		rep.Name = obj.Name
		local mesh = Instance.new("SpecialMesh")
		mesh.Scale = obj.Size * scale / rep.Size
		local list = obj:GetChildren()
		local objMesh = nil
		for x = 1, #list do
			if (list[x].className == "Decal") then
				local copy = list[x]:Clone()
				copy.Parent = rep
			elseif (list[x].className == "SpecialMesh") or (list[x].className == "CylinderMesh") or (list[x].className == "BlockMesh") then
				objMesh = list[x]
			end
		end
		if objMesh ~= nil then
			mesh:Remove()
			mesh = objMesh:Clone()
			if (objMesh.className == "SpecialMesh") and (objMesh.MeshType == Enum.MeshType.FileMesh) then
				mesh.Scale = objMesh.Scale * scale
				mesh.Offset = objMesh.Offset * scale
			else
				mesh.Scale = objMesh.Scale * obj.Size * scale / rep.Size
				mesh.Offset = objMesh.Offset * scale
			end
		elseif obj.className ~= "UnionOperation" and obj.Shape == Enum.PartType.Ball then
			mesh.MeshType = Enum.MeshType.Sphere
		elseif obj.className ~= "UnionOperation" and obj.Shape == Enum.PartType.Block then
			mesh:Remove()
			mesh = Instance.new("BlockMesh")
			mesh.Scale = obj.Size * scale / rep.Size
			--mesh.MeshType = Enum.MeshType.Brick
		else
			if obj.className ~= "UnionOperation" then
				print("This is a union, no mesh here!")
			else 
				mesh.MeshType = Enum.MeshType.Cylinder
				rep.Shape = Enum.PartType.Ball	
			end
		end
		mesh.Parent = rep
		rep.CFrame = cf:toWorldSpace(obj.CFrame + obj.Position * (scale - 1))
		rep.Parent = representation
	else
		if (obj == workspace) or (((obj.className == "Model") or (obj.className == "Tool") or (obj.className == "Hat")) and (obj ~= representation)) then
			local list = obj:GetChildren()
			for x = 1, #list do
				wait()
				makeRepresentation(list[x], cf, name .. "->" .. list[x].Name)
			end
		end
	end
end

local _, t = wait()
print("Reducing...")
makeRepresentation(workspace, CFrame.new(0, 1.2, 0), "Workspace")
local _2, t2 = wait()
print("Done! Time taken: " .. t2 - t .. " seconds.")