I framed the interior apartment spaces by spanning horizontals across the ceiling dimensions, then dropping vertical beams where the walls/corners/edges of visible space meet. When those structures were in place I used thin micro plywood/aircraft plywood, or 1/16 basswood for walls. In some case (rear walls) I used foam board.
The wiring for lighting either had to go in through the ceiling, or the floor.
Here the overhead lighting is going into place. The TV is a piece of flat wood with black paint and Mod Podge.
I usually make books in this scale out of wood strips, and paint accordingly:
The bookshelf is wood strips with some old laser cut parts meant for some lanters I designed at one point:
Since a painter lives in this apartment, it's only fitting that he has his own works here and there.
A thrift store lamp is all he can afford, so he gets a beat up lamp shade to go with it:
Rice paper glued around a cap:
For the ceiling, I used the back of an old notepad (perfect cardboard thickness), and bending a bit here and there produced nice cracks like you'd expect to see in a plaster ceiling:
Unit 21B still needs more art and will be upgraded as the days go by.......