I managed to get the sub frame connectors fully welded in, and started clean up on the penetration on the inside of the floor pan. I uncovered a thin area that I tried to initially weld up, but that wasn't an option. The area was too thin (+ my armature skills) causing the hole to get bigger. I eventually resorted to my first sheet metal patch which turned out okay. I still have a lot to learn when working with thin old metal. I have some holes to deal with, near the patch I installed, where the seat mount bracket is. That'll be a fun next adventure for me.