Thanks, it is my buddy's car, and we need inspiration. This heavy-duty body work by us newbies is hell. We read up(we thought), and cut out the old rot; cut the replacement 2" bigger, screwed it on the car. Then took a die grinder with a 5/64" thick disc, and cut through both panels at the same time, putting butt welds in as we went. WRONG. Use a thicker disc, even jumping all over, and using wet rags, evidently the gap was too small. After the warpage, read that welds contract when cooling, and the metal had to move- our problem. So we cut out some welds, and hammered back in, re-welded. Crapola.
AMD is almost perfect. And a Hobart mig (gas) with infinity dials kicks a Hobart flux wire's butt. And using a torch, and wet rags will help, but only on a small oil canning area (learned that on the rear deck; cut slices, heat/cool; got some out. Took a big hammer, heated, and smacked it down until no more oil canning, then welded the slits back up).
Neophyte country boys, but it is working. (can't wait for the gurus to pop in here, as they weren't any help. Wrong phrase; the" gurus" that only want a post count.).
Your friends are: 17" air body file, 3m paper from 45 to 220 grit (Norton kept clogging), The Harbor Freight discs for a grinder, just for welds(looks like a flapper, but on the face $5), ospho ($17 at Ace Hardware), a heated shop ( kerosene torpedo from Home Depot), and massive amounts of beer.