Kids Toy Car
I found this design at this website link, it's really cool and the entire project is again made from 2x4's ...although my Sketchup model has actually wheels and headlights you can simply paint this features on the finished car. I thought the car would look really cool in red,white and blue.. But again you can paint it any color you want.
If you want to undertake this project you can find all the dimensions and design on the above link.