OK, so I've got an idea. I've seen this specific method of cutting the rears on a Cherokee before, but I didn't ask whether or not the owner had unibody stiffeners or a cage.
The method is to rivet above the spot welds (maybe a half inch up) and cut away at everything below. Now I don't know if you simply cut everything off, or if it is that usual cut and fold only cut higher than the spot welds since the rivets will be in place. Anyone ever heard of this? Comments or ideas?