Nassau Suffolk Chromium Plating (or just about any plater) does CLEAR zinc plating by the lot. Give send them like 5 lbs of hardware, nuts, bolts, washers, screws, rear sprocket, brake stay and adjuster arm, clips, tabs, clamps, carb parts, etc and they charge about $100. Usually you send 2 batches as you forget a few things. If you get real fancy, yellow zinc some of the subtle bits like Honda did but hardly anybody noticed.
Don't powdercoat frame (problems, problems), paint it 90% gloss.
Let me know how the front fender cloning works-out, I need it, too asap!