Pinewood Derby Racer

Here is my pinewood derby racer, fresh from several recent wins.

Design:
I notched out the body, and built the back "window" to hold standard 1/4 OZ wheel weights you can buy at harbor freight tool. As it sits it weighs in at an EXACT 5.000 OZ. with a balance point of 1" in front of the rear axle. The wheelbase is a longer than an original drill pinewood derby car (see pictures), but the width and length are the same keeping it within regulation.

I have no wind tunnel tests showing tha