Alan,
Glass is just an idea among many.
Another idea is Plexiglas. Have a small piece and tested it for floating. It sinks easily and will probably adhere well to the bottom glass so there would be no possibility of detritus getting underneath. Plexi can be bought and cut cheaply at Rona.
Don't have a clue where to get starboard around here. Checked the yellow pages under plastics and did not see any mention of it in any of the ads.
Don't know what you mean about glass lacking aesthetically. Beauty is in the eye of the beholder.
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