Just had a look at the sample part that he did for me. It's not exactly as I was expecting, but I think it will be really cool so I told him to go ahead with the rest of the parts. I was originally thinking of going with a brighter gold, but most of the real RC30s have these parts in black or at least a very dark bronze, so this is a little more true to form. Also some of them are a little beat up still and the texture will "smooth" them out nicely.
It's dark bronze BTW, it might look black in the pic.
Obviously I've got to sand off the gasket surfaces (powder sometimes leaves kind of a nasty mask edge so I had him only mask things that I couldn't sand clean)