Quick update on the nacelle. I've filed off some of the chrome from underneath and it looks to me like it's made from copper? I scraped quite a bit off so I think it's more than just a layer of copper.
I've had only 4 replies from plating companies saying they aren't interested or it can't be done as it's alloy, and no replies from others apart from a company called Niphos. I'm popping down to them in Crewe on Saturday so they can have a look, they are the only ones who have shown the slightest bit of interest in doing it.