Hey Godsil thats some good stuff......especially the second one was pretty hot looking. Im no expert in this field and Im not entirely sure on how lucrative drawing up these concept cars can be even if sold to a manufacturer. BUT....

....in another forum I frequent a discussion came up on that Ultima GTR. And Id say a good number of guys LOVE that car, its concept and what its capable of.
Basically what Im getting at is this.......try coming up w/ a design that can be easily built as an exotic kit car. And find urself some wealthy guys who are into cars and see what you can come up with.
From what Ive read most of UK/Europe is raving about this Ultima....I dont think we have too many of those(or equilevant) right here in the States. They're designed to use a variety of engines but more commonly the Chevy 350/6sp trans. This car is lightweight and runs 0-60 in 3.3sec w/ a STOCK corvette motor.
Food for thought!
Gdluck!