for the ruins idea... maybe buy a cheap cement statue off craigslist. They're floating around the gardening section. smash it and use the distinguishable pieces in a rubble pile, like the face parts and hands
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I like this idea. Nothing except Jesus on Houston Craigslist atm, but I'm keeping my eyes open. I love Iwagumi, but btdt and the teardown / rebuild / teardown cycle isn't the what I'm looking for right now. Plus, there are a lot of benefits to having glass over the tank. Statue would be an attractive alternative.
I also like the submerged dock concept, but I'm not sure what that would look like. Submerged, wooden pillars?