I am retired from my business of powder coating, still piddle with it as I have all my equipment still. I can coat your calipers, valve covers or what ever else you might want to send me. 12 years doing this as a business and a way to bling my own stuff. Let me know if I can help make your ride that much more personalized.
NA valve covers and calipers can be done on an exchange basis. Pick your color, pay for the service with a core charge. When you receive your calipers, swap them out, send the cores back for core credit. This way you're not waiting a week or 2 for the powder coater to complete your calipers or cover.
I'll be looking for a core NB and NC valve cover and caliper cores if anyone has any spares