Here's that book I stumbled across. Probably some others just as good.I wish I would have watched my body shop friends more closely when they started shrinkin' metal with the torch.
There's a welder across from where I rent my garage who has interest learning the sheet metal stuff. He helped a little on the Wagoneer and we hope to do more when there's time. Anyway, somehow found this video about showing oxy-acet welding sheet metal panels with minimum distortion.
with Peter Tommasini
I'm sure there's other approaches but he seems to be an old hand that knows his craft.