This looks mint, I can't wait to try it out. My only beef is with some of your item choices. I do not think that using HL2 or any other game material from something other than TF2 works well, I have been on maps with HL2 stuff, it just doesn't look good. try to find what you are after from the various TF2 models, such as replacing the car with one of the truck models. If that fails you, you can try your hand at making the vehicle or whatever else out of brushwork. it takes time, but can be worth it in the end.