Thanks Dice!!
Went in to a ceramic store today and asked them if there was a waterproof mortar they recommened, as I know next to nothing about this stuff. The recommendation I got was Silicone — the same stuff they use to seal up tubs and windows apparently. I'm guessing Silicone is inert when it sets, so I think I may have a solution. What I'm considering now is do I set up individual containers with their own reservoir, or one big container with a shared reservoir...
I'm thinking I'll try both — a few in one big container, roots separated by a thin sheet of something, maybe with some mid height companion plants like Borage intercropped in. And a few in their own containers.
The last thing I'm trying to figure out is what I can use as the aeration bench. Preferably with holes in it already, but something I can cut circles in for the wicking chamber. And of course cheap and non-phytotoxic. Maybe some big sheets of plastic or something...
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