Aluminium is a bit more user friendly than bronze - at least judging by your experience polishing bronze. The only thing with aluminum is that it sometimes can be a bit hard to get paint to stick to it. If you use an etching primer, it's no problem. I find the Rustoleum rattle cans work quite well for this. Just don't sand the aluminum with sand paper finer than 320 grit. You want some surface roughness for the primer (or clear coat) to grip onto.
Spray painting with rattle cans can be a royal pain, though. It took me nearly two weeks to get acceptable results on my 300B build. I think next time, I'll look into anodization.
Of course, if you have access to a bead blaster, you're in phat city. Bead blasted aluminum with a clear coat can look really good.