Here this video will explain everything..
Any insight would be appreciated, I am new at modeling btw.
http://www.youtube.com/watch?v=DIew8gexotM&feature=youtu.be
You can't view things in zmodeler that are inside the car unless you zoom into the car but when the vehicle is exported and in game it will be view able.
It works fine for me except for one major issue. I can make a complete model but it will not let me export it, it will go straight to (Not Responding) may have to do with the OS because it works fine when I export on Win 7 :L