(Ref: George Eppie in 181119 MMDigest)

A couple years ago I had some timpani parts chrome plated by J&L
Burnishing and Lacquering in Atlanta, New York.  His phone number is
1-800-833-0146.  Not sure if he does gold but did a great job on my
chrome parts.  Maybe a good place to start.

Good luck,
Kevin Mayes