Howdy,  it would be nice to have a blow up assembly drawing of the structure for repairs, but I bet it you can't get one.  I know I could never find anything like that for any of my campers and all needed wall / floor / wall repair.  But the last one - a Winnebago has that on line. Full electrical , plumbing and pretty good structure drawings. So you are probably going to have to continue taking stuff apart to find out how it is put together.  :You will probably have to make some parts (back up blocks, addtional supports.... yourself.