Get the closest possible to the maximum5.0 oz.
Step 1: Acquire all the parts
1 Ea. Pinewood Derby boxed set.
4 Plastic wheels
4 Metal "axles" (nails)
Set of fishing weights
1 Ea. 35mm Film Canister with lid
Fast Setting Epoxy or Hot Melt Glue
2 Forstener bits (1 the size of the cannister, and the other slightly larger than the lid)
Dremel Tool with sanding drum attachment
(You can forgo the drill press and bits, but you won't get the tight fit that looks good.)