At last I completed my 3D vehicle. It's a three wheels vehicle, with a strange design which seems midway between old and futuristic style. I wanted to make something new, different from any other car I've ever seen. So I projected a rear steering gear, a big rear wheel with inside it a powerful engine. The front wheels couldn't steer and the've two disc brakes applyed at external sides of the rims. With a little of imagination this car could also work ;-)
I modeled it in 3DStudioMax5 and made the few textures with Photoshop.
Here is another thread with a realistic render of this car in a raining night environment: http://forums.cgsociety.org/showthread.php?t=311875

Here is the full image: Link

Here is the second full image:
Link
Thanks for your comments, Andrea