Reusing car parts and sounds

[kcid]

I think of the first possible problem like this: if somebody installs a car with no custom tires/wheels and he/she doesn't have the standard wheel pack installed he will automatically use a set of default wheels.
Problem 2 is also thought about: if somebody builds a car with custom wheels he just puts the wheel files in the directory of the car like we do now. If done like this vdrift has to look for custom wheels first and if not found it will use the wheels that are mentioned somewhere in the .car file.