For really fat frames where the fuel tank mounts I've used 0.050 thick aluminum strap to make the tank straps they will polish out nice or can be painted. I'm going to have to try anodizing some aluminum sooner or later I'm not too hot on having to use the sulfuric acid to do this but being careful and having baking soda on hand for a safety precaution will help. Good rubber gloves and face shield as well. I'll let you all know how it goes if I do try it and Bob will let you know how bad it went if I do have a problem
Norman