I haven't started the body as yet but, I was looking at the spectacle plates and wondered how to glaze the holes therein. From the photos that I've looked at, these windows (not sure what they are called) were made opening inwards. Not only that but they were top hung with some sort of catch on the lower edge. The 'windows' that I've turned up are glazed with a microscope slide cut to fit the rebate. When the time comes, I'll most probably glue them in place.
The top three are glazed and have the inner and outer frame fitted together.
In this picture, the glass is laying in the frame rebate on the left and the upstand on the frame on the right will fit into it holding the glass in place. Originally, I had allowed for a glass thickness of 0.016" as that is what the thickness measured at. When I came to actually cut the glass, I realised that when I measured the thickness of the glass, two pieces had stuck themselves together and the real measurement was 0.008". It all turned out okay in the end, though.
Jon