How to obtain OEM vehicle shell models for building assesories?

Does anyone know of a way to get vehicle models for building accessories off of?
Chev, Dodge, Toyota, and Ford pickups.

2 Answers

I think the easiest way would to use a 3D scanner. There are some pretty good app for your phone, like 123D Catch.

Thanks Troy,
I will give it a try...
GM sent me a nice package with models of what I asked for, wish the rest would have the same service.