I've seen another company utilize there plastic fit together trailer parts to make FEMA type temp. shelters. You could do that with yours also, instead of mounting to a trailer, mounting shelter to a pad built on the ground!
What is thickest plywood you can use? Its 1/2 now, with age has become way to flimsy. Id love to use your parts to get her back on road. My kids have kids, and probably would end up with it for there family! I hope your parts are picked up, If not Id be up for some experimenting with first runs.