had a long post and some of my typical brain dumping
Figured it not appropriate or necessary, so...
The summary: the dude that built that chassis is a total dipsh!t (which appears I simply concur with everyone else here so no news there). A kid that saw a handy man build a deck on a cabin "this one time at band camp" could do a better job. At least he would have seen a guy use a plumb bob, level, and tape measure to square up the framing.
I hope you can keep it rolling and get back in there, and I am with everyone else, keep the faith! I can imagine how hard it is to stay motivated, but I too think it will be pretty bitchin' once it is done and fixed by a guy that knows his stuff.