And welded in:
Still a little work to do here, but it's mostly done:
And some other fixes I had to make:
Until now I've had very poor experience using my weld-through primer. After reading a little on the metalmeet forum, I found another way to do it. I'm now spraying the "overlap" areas in the primer, then assembling and drilling for the spot welds and drilling partly into the bottom layer of metal. This cleans the primer off the bottom layer and allows me to put a decent weld in there. Without cleaning the primer off, it didn't "weld-through" worth a sh#t. I'm still not absolutely convinced it is necessary since it lasted 60 years without...but I really don't want to be wrong and have to do this again.
I'm also planning on seam sealing this area extensively and probably spraying on bedliner to finish it off.