Michael Chestnut in the states has done plating for me and numerous other collectors out there.
He does parts in brass - not gold - and due to the volume he does, he has many parts ready for 'exchange' - you send in your 'core' part, and he returns a replated part with a bill.
Thinking I may have him brass my coin toss and wireforms when I get to that point. WCS is a great game.
I bought a NOS gold plated wireform off eBay years ago, and it was damaged in shipping. Too bad, as I got a great deal on it!