Alan - Airplanes that used flying and landing streamlined bracing, incorporated stainless steel I think. The round stock was reshaped in a streamlined appearance, except at the outer attachment points where it would thread into a clevis. Rarely have I seen any that were of highly polished appearance. Perhaps a medium gray or steel would replicate actual bracing color, my wife gave me a colored marker set that has dozens of colors, metal included. I've used them on a number of different rigging jobs and I was pleased with the results, they build up less material than paint does, so the lines retain proper thickness.
The job is coming along beautifully, thanks for all the photos, it looks great.
Patrick