I found a place in Manassas, VA, about 30 minutes west of me, that does anodizing and powder coating. The problem are fundamental though. All of apple's pieces are finished goods, with some kind of plastic attached to all the metal bits. for powder coating, the pieces have to be sprayed with a electrically charged dust, and then baked. Finish is tough as nails and gorgeous, but plastics would melt during the baking process.
Anodizing also involves heat and electricity, but adds the fun of water, lye, and several other acids. There's some guide stuff on anodizing at the link below for those interested.
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