Pinewood Derby car for Cub Scouts ( begginning )

I am making a Pinewood Derby car for Cub Scouts with my dad. At first we were trying to make it look kind of like a Hot Wheel I had. Then we watched some short Pinewood Derby races on the internet. Then what looked like an almost completely flat car won the final race I believe! So then we started to get it more straight. The only tools we've used so far are: 3 chisels, hammers, sandpaper, and a pencil.