Yesterday's progress.
Cut a section of rust out.
In goes the patch. (about 2 hours to get it to fit well) Coated it with weld thru primer.
Those are magnets I bought to hold things in place. Got them from Eastwood. Totally worth purchasing.
https://www.eastwood.com/stitch-weld-magnets.html
Tacked in. Now about a thousand stitch welds and we can grind it smooth and get on to the next patch.