The Alum coats are nice, but I'm not a huge fan of powder coating personally, nothing wrong with it, just not something I wouldn't do. Anodized would be my first choice...after polishing that is
Not many places can do a tub that big, and trying to deal with tanks and all that, big mess I thought. Don't think I could afford it if I did find a shop that could do it. It looks plenty good as is IMHO.
Sandy