Paul,
You might try contacting Bill Neale, either by e-mail or phone. His website is
www.billneale.com
Neale is a longtime friend of Shelby's and, from what I recall, was a co-creator of the "Terlingua Race Team" concept. I believe he designed the logos, and perhaps even the paint schemes for the Trans Am Mustangs. I've never met him but understand he's a good guy. I do know he's a hell of an automotive artist, which you'll see if you visit his site.
Good luck,
Bob