Thanks. I tried it several ways. What worked best was to lay the sheet on the tubes and start clamping it from the front to the back using two by fours to spread the stress. I worked some of it with a hammer but not much. I removed the sheet, welded on tabs from ruff stuff that are threaded. Spaced them where I wanted and then put the roof back on. The hardest part was drilling the holes for the tabs.
I did try to anneal the aluminum, that really did not work that well. I was able to get it to relax but getting the Aluminum to the right temp was tough especially on such a big piece. I only wanted to anneal the first 10" or so of the panel. I used a candle to coat the sheet in black then a map gas torch. I probably would have had better luck with Oxy-acetalyn. But I don't have one.
I then finished the roof with a plastic sander for removing paint and WD-40, that dulled it out and removed the scratches from the install. I used a sheet of 5052 1/8", you can use 3003, but for some reason that is hard to find up here. Working on it off and on, I probably have 8 hours in the roof. If I had a metal brake, I think it would have been easier.