Here's a 962 I made for the parent's class the last year my son was in cub scouts. Its made from 2 pinewood derby kits with 1 block cut in half and glued to the sides of the main block to make the full width body.
The first year my son was in cub scouts, I made a car and I made my wife a car to compete with. Since we're near NASA, the parent's class is really competitive with every engineer dad trying to out do the others. My car was a dragster that was fast but more for fun while my wife's was a slim go fast machine. My wife won. The pinewood derby chairman came up to me afterwards, congratulated my wife on her win and then told me the winner of parent's class is next year's chairman and since I obviously built her car, I was now chairman. Oops!
P.S. we used tungsten for our weights so we could get the weight as far back as possible. On my first year dragster, it did wheelies down the track because the weight was so far back.