[aerohead]

Are you going to hammer-form annealed sheet into a complex shape,or rivet structures to pliable sheet and settle for what you get?
NASCAR old-timers have essentially created body mockups on a car,then attached the car to a rotisserie such that they could rotate the car enough to cast concrete molds over the mockups.
After a 30-day cure,sheet steel was hammered into the concrete tooling.With cutting,spot-welding,re-annealing,and additional hammer work,sheet metal body parts were created.