The engine cover was prepared by a business here which paints them to your custom order, you pay a fair bit for the privilege, but it saves running around and they look pretty good.
Bcause they mostly sell to Golf R customers the covers have the original Audi logos removed and made good where the logo used to be. I asked for the Audi badge to be put on, but wasn't sure if they were going to do it or not, so it was a nice surprise when the cover arrived today. I wasn't expecting the spare silver logo, but I think you're right, it ties in with the silver pinstriping quite well.
It may be tricky to remove the black badge, so it may be that I leave it the way it is, which still looks good to me anyway.