As other commenters noted, this is a prototype so it would have been done by hand with an English wheel and similar forming tools. There would be a set of maste

As other commenters noted, this is a prototype so it would have been done by hand with an English wheel and similar forming tools. There would be a set of master profile forms that the craftsman would check against to ensure that the panels are the right shape along various cross sections. For a production vehicle, they would have used a heavy press to stamp the panels, as they do today.