my 33 humpback panel truck will require a custom fabbed gastank, but cousin charlie's model A rpu. is at the stage he needs a tank fabbed to complete his build[well, a buddy and myself are really building the chassis for it.....] before the paint can be applied to the chassis. my question is this. what material should i fab this from ? i have been leaning toward 16ga. stainless, but would also consider aluminium and possibly coated steel. other than the obvious welding differences, anything i should consider to base my decision on ? i will be making the pattern from cardboard as it must fit a pretty tight space. i'll do his first, so incase i goof up the first time, he can buy more material. baffels will also be included as necessary. thanks in advance !