The temptation now is to launch in and model everything that's possible to model before your car is complete. As I said before, that's a wrong way of going about it. You'll get discouraged. Besides, this is game-asset modeling, where "light is right." Keep your models light in detail, light in file size. Light is right!
Actually, your car is almost finished anyway. Or, at least the mesh is. There's just some obvious glitches in the mesh that we have to see to, and then we're done!