Chris,
looking good...seems like your fixing the right way, great job. Ever consider moving the wiper to the inside of the firewall ? It's a pretty simple task and I'm sure it's within your skill level buy the quality of the work so far.
Looking at what has been done so far, and the work to do the wiper motor area- If I were to do it all over I would cut out everything north of the trans tunnel, roll a piece of metal through a bead roller weld it in and call it a day.