I would suggest that you use a stock handle bars and plate then copper. See my post: in this section DIY Plating & Power Coat at Home!!!. You can also send it to a crome shop that does copper.
I sanded mine and painted them with copper paint. You can leave it bright or fog it with a little dark brown as I did to antique it. The metallic copper paints look like the real deal.
I'm sorry, I know this is a bit off topic. I just had to ask: Fish, did you mount your headlight upside down on purpose. You've built such a fantastic bike, and have skills I only dream about at this point. I figured maybe you had a reason...