What do professional artists do when preparing blueprints/reference images for vehicles like this with complex shapes as you can see on its side. I am asking since I have seen a lot use orthographical front-,side., and top-views, but I cannot see how these views used as blueprints would feature such complex shapes.
About 90 years ago car stylists started to make 3D clay models of the cars. They used some special wax which was suitable for full size models.
The method is still in use. Designing is team work. Everyone in the team has direct interaction with the model and other team members. There's no computer software making limitations and suggesting shortcuts. Of course some concept drawings exist as the basis, but the final geometric forms are sculpted to wax (it can be inserted, too, if needed)
When artists have finally created the model, engineers scan it and find a way to build it. Of course some drawings are needed, but the geometry information is 3D as soon as the artists create it.