Last year G and I built a car for the Awana Grand Prix. It was a good bonding experience for us, which I think is the point. I involved her in the process as much as I could. It is supposed to be her car. I did all the dangerous cutting work and she did most all the painting. She also made most of the design decisions. Overall I would say that it was a fair collaboration. I also did the best I could to teach her the physics of how to make her car go fast, what kinds of things would slow her car down, and how to overcome them.