O.K., that's where you lost me. I thought you were refering to real, 1/1 scale carbodies.
Alright, I'm no longer confused
If you want to give it a shot, with making them into rusty cars, I have a good source for you: The Model Junkyard crew. They have a thred here showcasing their latest works, and they have a website all for it (they sell their on-line E-books there,too) I highly reccomend signing up for their free newsletters,too since they give discounts, as well as a suprize for when you sign up
http://www.modeljunkyard.com/
Huh, it's a small world. You live close to me, Jumper 180. I've been to Live Oak for a machinery day that a church out there was having. I can't remember where, though