[Captainfab]

Wow you don't mess around...nice progress. Welding sheet metal takes some practice. You don't want to try and make a long weld as you would on thicker material. On sheet metal you want to make a series of tacks, skipping around so not to build up too much heat. Sometimes you might need to just go do something else until it cools to the touch. When you do end up with a gap, start your tacks at the end of the gap, and then work off of your last tack since that will absorb a lot of the heat from the next tack. If you can get a hold of a heavy piece of either copper or brass, you can use that for a backup behind a gap or small hole you want to fill. The weld won't stick to copper or brass.