I added some aero bits to the race car: fender extensions front and rear to 'hide' the wheels from airflow and a splitter.
Although I do just fine with the engineering and making stuff work, I'm always a little rough in th finish and polish department. So I decided to let my daughters finish the car. I just painted it white. They picked the colors and did all the painting. I'm really happy with how it turned out. I think I'm going to let them redo it each year and we'll see how it progresses over time.