Yeah, thompson's penetrates wood extremely well. It's a good last line of defense. Coupled with spar varnish (same stuff they use on cris craft wooden boats), it should provide plenty of waterproofing protection. At least in my application.
I am not going to interlock the plywood. My plan is to have 4x4 posts at the corners, therefore, plenty of wood to adhered the background to. It should also provide a decent amount of stability for the background, which will be 2 sides and 4' above the pond. I don't plan on growing anything huge on it, so it should be plenty.
Fiberglass is a must! I couldn't imagine building something like that without the added strength. Although, I do tend to over engineer things I build. Lol
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