I can't even fix the wheels on my children's little toy cars! However, I have found a website for you that explains how to build a race car of your very own. http://www.ehow.com/how_2325401_build-own-race-car.html. I do need to warn you though that www.ehow.com is a very addicting website. Before long, you'll be trying to make all sorts of things that you really have no real use for!