Frame Repairs
Got the section out. There's no way one could do this in a junkyard in a day (or maybe at all). It took me an hour to get the rivets out, and that was with a hellacious air chisel.
The crack is longer than I first thought. My plan is to clean it up, weld the top of this section, then plate the bottom portion. I'm going to build a new leg and foot for the portion the rotted off by cutting off the thin metal and plating new metal on. The rest of the frame looks solid, so I think the frame should have no issues. I'm going to clean it up and paint it as well while this is off.