i recommend this....take a script from another vehicle.model looks good though.
Stop loving telling people that, that's never the right thing to do, people always forget up and overwrite existing datablocks.
EDIT: Do not release, if you want it to work then well you got some problems such as: Wheels aren't part of the model, That turret thar is gunna take some epic scripting, and that model is ugly as forget.
EDIT2: And if you were to make wheels that high the second you hit a bump that car would be through-the-ground.