Oh my god. My dreams literally came true! About to test it, will come back in a bit!
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EDIT: Okay, just installed the mod, bought the California (aka Vette). Here's what I got to say about it:
The 3D model from outside looks BEAUTIFUL! I Walked around it few times to admire it :)
Small detail i noticed: the rims don't have Corvette logo on them but its a minor thing.
Interior: Since the game is kinda a mix between sim and arcade, I always drive in First Person. I've noticed that the windshield glass is too dark to see through. The interior (such as dashboard material) is bit too bright. One big deal for me, the steering wheel is not turning at all.
The sound. Currently its the default Calfiornia engine sound, but seeing how you were originally a sound modder you will probably work on that :)
One super small thing. Selecting white color when buying a car makes the logo on the front invisible (possible on the back as well but i couldn't see)
With this i only try to help you fix this mod to perfection. Im not in any way criticizing you. You are doing a great job. Keep it up! ;)