Local shop in Houston did the chrome on the handle. A motor cycle shop recommended them.

Plastic is a different beast. I chased a couple of leads on getting the plastic chromed. I found a shop in California but it was a minimum $200 order so I passed. You can try vaccuum metalizing (www.mrgusa.com) but it apparently won't hold up to much touching etc. IIRC, some folks in the forum were trying to custom chrome plastic with mixed results by first applying a metallic coating.

I'm going to try casting replacement buttons in wax and then having those cast in metal to get the chrome finish.

Mach