Small post, had the original +4 chassis up on sawhorses today to look over it, and discovered even more significant damage to the frame. In particular, the rear section was pushed over about an inch on one side, and bend over about 15 degrees on the other side.
For this much damage, it doesn’t make much sense for me to reuse the original for how cheaply I could get a new one. I’d hate to spend so much time and money on it only to have something out of line, or worse, fail at a later date (like when I’m driving it).