You can't customize that.
Let's play a little game.
What we're going to do is name a car and the next person is to come up with a list of modifications he would make to that car. He would then list another car for the next person to "modify". But it shouldn't be a car that can be customized easily. It wouldn't be much of a challenge then. We have to come up with a car that can't be customized easily and be a real challenge to trick out.
That said, I'll get the ball rolling.
Isetta.
"The Devil wants his soul. I just want the man."