A model of a school bus I made for a project. It is split into four parts, and it is completely hollow on the inside. No steering wheel, seats, nada. I also designed it to install moveable wheels on the bottom, so that means it's lacking wheels.
Notes:
A raft or a brim is recommended for all parts. Supports are needed for the body, but not the roof. A higher infill is also recommended for the body of the bus to help with layer adhesion.
I used ABS juice to connect the body and roof. I also plan to install hinges on the roof so I can tip it open. I also used tinted cellophane for the windows. I'm also adding some pinewood derby wheels from my old cub scout days to make it move.