[Modges'66]

I then sand-blasted the area & primed it with self-etching weld-thru primer,
& used a repair patch-panel as a donor for the repair. I cut & ground the patch for a near perfect-fit, & primed the back side of the patch before welding it in place.
I welded the panel in using a series of random placed tack-welds, being careful not to get the panel too hot, to avoid warping. Ample time also needs to be given for panel cooling between welds. Spot, wait, spot, wait......wait! spot, wait! Sounds like a childrens book!
The process took awhile, but turned out pretty nice.