I heard these kind of things you make are kind of high poly, is that an issue?
Also, does collision, raycasting work correctly? I have no idea if you can build inside/on such models.
You can build inside the houses yes, of course. You can't build in the doorway or windows.
I don't make high poly bricks, It's just I add little detail. The collision is right on the roofs
If you want you can come on my server to have a look at them