For what it's worth, I tried the same thing. I built a '67 coupe with Shelby fiberglass. Same thing happened, everyone either assumed it was a Shelby (no coupes built for production), or that I was building a clone. It wasn't even close to factory, as it had an EFI 5.0 with a 5 speed tranny, and seats from a Fox body.. The car was built the way I saw it in my head. I fell in love with the GT/CS in high school because I loved Shelby, but always thought he should have built a coupe. Don't let it get you down. Enjoy your passion and do what makes you happy!