Outer Limits 4x4 Board

i am in the market for for a fuel cell for my project zook
what would suit the best
plastic or alloy ?
foam filled or hollow with a surge tank?
or would a baffled one be better?


i am looking around the 40 to 50ltr mark


thanks
pezz

Rocket industries make an assortment of them, used one in my old lux, never had a drama.
Denny