I was working on a simple low cost building system for 15mm. So I’ve done it. I kept the design simple so further add-ons can apply.
Part A has a door so you might need it only once for each building. Or you might want a back door. Part B has three windows. Part C is roof and Part D is for floor.
This picture I bring together 1 Part A and 3 part B. They do have joint points but not enough so I glued them.
Part C roof added.
It’s also possible to stack them. Each part is only 1 USD!
Easy to ship!
Soon will be on store.