Well, at last, all the bits are done, including the gun sight which I forgot to photograph in the last up-date! As Andy discovered, the sight's reflector screen scales out at around 2 inches thick (50mm), so this was removed, and a new screen made from thin clear sheet, along with the supports. All that remains is to fit the brass title plaque to the base surround, and I hope to have this on Friday.
I'll start a 'Finished' thread separately, but meanwhile, having already sent pics to Max and Barbara, here's a small preview. Note that the lighting is a mix of tungsten and flash, hence the slight blue cast in some areas of the photo.
Many thanks to all for your support and kind comments during this project.