hmm, i think you're right about comfort, especially if the model is not wearing any clothes. 
I do a little wood work, nothing special, just utilitarian stuff, but I think i would avoid trying to build something like this. Time is money, and I could see it becoming a super long project.
If I was going to attempt it, i would build a box with one open end, and then put a laminate (for comfort) around the outside. Maybe with the open end you could design bolts that hold the whole thing together and remove them to break it down into pieces. Honestly though, I think the underlying structure would have to be such that even if it broke down into 5 sides, you might only save a small fraction of the assembled box. Instead, maybe look into making it a storage area when not in use?
PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20