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Thanks for that write up, i think i have the idea down.Sorry mate, I searched for pics, and could not find the ones that I am sure I had a few years back. Just, for example, nail a square (or whatever proportions) frame of 2x4's on edge, nailed together at the corners. The size of the wood won't cause a problem, the plant pots will always be >1.5 inches from the walls of your tent. Once the frame is together put it in your tent, lay poly in it, fold it at the corners so you can take the bottom right to the lower edge corners of the frame, staple to the top edge of the boards, and you have your 4x4 (or whatever) tray, waterproof to the top edge of the 2x4's. If you want to save a bit of floor space, you could make the frame out of some ~3" strips of plywood.
When I use this setup for three ten gallon (so called) bags, I used 2x4's for the sides of the space, and bent arborite around the rounded ends to match the pots. I also put foam in the spaces between the pots to prevent excess water when the valve floods the tray. I would be careful about trying to subirrigate a bunch of pots with an autovalve if the tray has lots of space between pots. The extra volume of water between the pots will increase the amount that plants need to use before the flooded portion of the pot medium is aerated as liquid gets absorbed by the plant. A simple square tray will work a treat for just containing leaks or the like, but for subirrigation, I would try to reduce the volume of water between the pots.
I think I have given up on autovalves except for soil/water only grows. Next grow, I plan to use automated top watering like I did for my last solo run. The run will be in coco in ~2gallon pots. Should be another learning experience.
I'll use smaller totes since smaller space will work better with the valve idea.