If I get the whole mess working right...I will try an Aluminum cluster just to see how well it holds up.
I'm not really worried about the wear that might be caused from shifting...It's more that I'm thinking large diameter sprockets made from thin Aluminum may flex. We'll see...I wanted to try steel to start with to give the whole idea a fighting chance.
Stainless wasn't necessary; I could have used mild steel. I just figured if these are the only ones ever made...they might as well be stainless.
In the end...if the Aluminum does hold-up...it could be a viable product.