How about a nice acrylic fuel tank? The overall concept isnt hard... We've used acrylic / polycarbonate (thick and thin sheets) to construct some pretty damn large aquariums... It's easy to use and work with and also lightweight and 10000000x stronger than ABS plastic... (maybe over-exaggerated there) but the stuff's strong... Maybe, since I have my rusty apart (That wall hit... cracked the engine mounts in three pieces... ), I will take the fuel tank out and inspect and see if I can make a fuel tank
I don't imagine it'd be that hard, the hardest part would be the actual lid from what I can see.
Go to the 1/8 Scale Buggy forums and check out the opening night @ Medina last night! Pics up and they are good! Was fun, Nitro's the way to go! (but Im still upgrading the tamiya trucks!)