I received the prototype binnacle covers yesterday. I will try and get some pictures up tonight to get a verdict from folks! Initial impressions are reasonably positive. As you'd expect size wise they are a perfect copy as they are a 3D scanned copy. Clips and everything look good so should be a perfect fit.
The minor downsides I guess are that they're printed in a white plastic and then painted black on top. The coverage isn't totally perfect but I think once they're fitted you'd struggle to see any white plastic anywhere, and for those that were not totally happy a quick coat of a gloss black plastikote or similar would do the job. The texture on the top isn't exactly the same, but again, given the size of the pieces and their location, I'd be surprised if anyone noticed.
I'm building myself up to prising off my current speedo binnacle covers (because I'm worried they'll break!) and test fitting these to see how they look over the weekend, and subject to feedback on the pictures, will be looking to put an order in with the company soon. Prices look to be as I estimated - about £10/pair delivered.
Further updates as I have them!