How to cut a pinewood derby car to look like a super car
Ryan, if you're not already done...one thing that hasn't been mentioned here is a "Dremel" tool (that's the most popular brand name, for a handheld rotary grinder.) They're pretty inexpensive and come with multiple bits/heads for different uses (like, wood versus metal.) It's a faster, easier way to do soft wood shaping (versus carving and hand-sanding.) 
When we made my sons' Pinewood Derby cars, both won for "Best Design"... one looked a lot like the original Batmobile.