Simpsons house

I managed to get this to work for the most part on Auto, its over 2000 pieces and the top floor had to be built by adding the tiles manually, really cool build thanks for sharing

Cool concept but I tried on single player with creative mode enabled for a few hours in as many different ways as I could, but the floor/ceiling pieces aren't able to be placed. Not in auto build mode, nor in single piece build mode. Nothing I've tried allows this build to be completed other than the exterior walls and foundation pieces.