First I focused on repairing the inner section, where the heater channel actually goes into the firewall. I tabbed the ends to allow a mating surface to weld to the firewall. This will make it as strong as new.
After getting everything all welded inside, I cut and welded in the front section for the firewall. I failed to get a closeup picture, but you can see the patch in the following picture. The green is putty that I used to seal the weld seam. It is unnoticeable now.I'll leave it at that for this post. Much more to write and catch up on, but I will break it up into several posts.
See ya soon!