Hi Ian,
Thanks for asking. Perhaps I should first refer you to – The case for clocks
Since a glass dome was not an option, I toyed around with various alternatives, bearing in mind the need for the case to breath. The range of (indoor) temperatures here in Melbourne, is quite broad, and dust can also be a significant problem too.
Finally, a trip up the road to the local glazier proved most rewarding. Although it was certainly not his main line of business, he told me that he was used to making cases in the way I would like. His price was remarkably low, barely costing much more than the glass. All the edges had been ground off, and there was hardly a sign of the silicone adhesive.
I should try again, to see if I can get something worth looking at.
The glass slots into the wooden base by about 7mm, while a fairly heavy cloth provides decoration, a dust seal of sorts, and a means for the case to breath.
Best regards,
Sam