Many years ago, as a break from work, I use to day dream about how I might make a folding cabin on a small trailer (6x10). I wanted it to be like one of those pop-up cardboard things that you see in childrens' books. (Or, more like a transformer, that would start out as a totally flat, stacked set of studded walls and roof sides, that you would simply start unfolding, with all of the pieces connected by hinges, and end up with a normal looking cabin, roof and all. Long bolts would be inserted in various holes and joints to fasten each piece tightly together as they unfolded, and tightened with washers and hand turned wing nuts.
In a sense, it would be like a chinese puzzle.
I even tried to calculate the total weight, using 2x3 red spruce studs, and half-inch exterior plywood for the sides and roof. The weight built up pretty fast.
Well, I've been retired for 7 years now, and never have gotten around to it. Guess it was just not that important.
Mannyrock