Right idea but the wrong 'bird.

Seen the Petty version of Monogram's Superbird? It missed the mark by a bunch because it was just a stock 'bird with some decals. They should have gone back a little further and got one that was almost like that when it was real. Some roll bars from the kit "runners? and a set of steel wheels and you're in business.
http://mediaservice.photoisland.com/auction/Sep/20039181661258805839613.jpg

Cool box.... but I see a.... 1969 Ford Talladega (I'm positive..) on the top of the box.

*edit*
Forgot to add... Terrific job on the model! Got any more pics?