The inner units also would have zero windows. Even if that wouldn’t make them so undesirable as to be basically useless, that probably would be in conflict wit

The inner units also would have zero windows. Even if that wouldn’t make them so undesirable as to be basically useless, that probably would be in conflict with building codes in large parts of the world. the best you could do is a fairly small sphere with kitchens, bathrooms and storage spaces in the inside.