With your skills you could do some serious aviation sheetmetal. Granted its mostly aluminum, and typically held together with all rivets, hylocks, and jo bolts No welding However theres warbird restoratiin places that restore old WW2 fighters, and bombers. Sometimes the parts they have to fabricate using 70 year old blueprints from the original manufacturer which may no longer be in business. I have seen places like these restore aircraft where there might gave been inly 20% left along with its serial number plate. And fabricate everything to fill in the blanks. If you have never been up close to an 1800 HP Rolls Royce Merlin liquid cooled V12 with short stack exhaust, well damn. Thats a hot rod. Or an allison liquid cooled V12 with turbo supercharger, another hot rod. Rhese things have pistons the size of coffee cans monster sized valves. These were the got rod fighter engines that ran down hitlers luftwaffe.