Daz_far, many creators have used premade meshes and made lovely car objects. Just make sure you separate the necessary parts such as wheels, doors, etc.
BTW, I if it isn't too much to ask, I'd love to see the smart car once it's finished as I like the look of them and was actually considering making one myself at one time. If you make it, I'd love to have it in my game as well.
you see the problem is i dont have Milkshape, i use 3DSMax