bead roller ?
Lazze has bead roller dies that will do one side of a fender at a time. Ron Covell also has dies . I saw a pict of a machine from the 20's that would make curved rounded edge old car fenders in one pass. join the metal working forums, Metalmeet, allmetal shaping. etc. check out david gardiner from the UK. metal shaping with simple hand tools. a lot of different tools and ways to do the job. Kirkham uses stretch dies to make their Cobra panels. Check out all of Lazze's free Utube video's. he also sells dvd's of the longer instructions.