Our friend, from the frozen far north, is up to his old tricks again. Tony recently built this custom roll pan, on the back of a Datsun pick-up truck bed. BUT...this technique could easily be used on any Hot Rod or Custom. Watch and learn. Custom roll pan made easy - YouTube
If you are going to weld it. You have to be able to grind the welds flat. Here is continuation, after the welding is complete. Link ----