Used to be the realm of custom only. Not sure if anyone is currently making a production one or not. Haven't seen or heard of it, but it would be nice to see one.
What effect, if any, do modern fuel mixes have on aluminum?
Main thing in the past was cost and bashability. Now with more EB's on the street only, the weight savings can be more of the benefit it should be.
Rust-proofing was not enough to pay the higher "custom" prices for most EB owners in the past I'm sure. Easy enough to use coated steel or a coating after manufacture on a steel one, and not feel so bad when you smack it repeatedly on the rocks.
I wonder if aluminum would need to be coated too, due to the odd fuel additive that might not play nice with aluminum?
I know some here have made their own, and even posted up their plans at times. Maybe someone knows a company and will chime in with info.
Good luck.
Paul