Incidentally, automotive frame dies are huge. Think a multi ton several cubic meter hunk of metal. Tooling (making) the die takes a lot of time, and getting a correct die takes even longer. Designing a die is an art. You have to know how the metal will respond to your particular shape with your particular starting point. There isn't a CAD program in the world that can design a die perfectly.
I believe alpha stage cars are made with non production dies that are made of a different, easier to work with material. Production dies are then made out of much harder material based on lessons learned from the prototype dies, but even those dies need to be tweaked.
I believe alpha stage cars are made with non production dies that are made of a different, easier to work with material. Production dies are then made out of much harder material based on lessons learned from the prototype dies, but even those dies need to be tweaked.