Time for some fab!
Welding beads shrink a bit, so I put a couple dabs around the corners to keep it as stable as possible before laying down the heavy beads.
This double joint was a lot simpler than I expected.
More comments on tools:
A good machinist combination square would have been a big help, but a square and a little trig can do the job. Many things sold as protractors are not worth their salt.
The 90 Amp flux-core welder is not a nice tool for fillet joints on 1/8" steel. It can get the job done, but it's a challenge to do it and be certain that a solid weld has been achieved, and time consuming. Something more like a 120 Amp MIG welder would save a lot of time, but not that it matters a ton for a one-off.
Still a few important bits needed, but the frame is basically assembled and test fit on the hitch receiver here.
