Yes, those are the 27.9 x 20.3 x 6.3 (27 liter/7 gallon) multi-purpose mixing trays from Lowes. I left 8 1/2" from the bottom of one frame to the top of the next. If you are planning on using individual water bottles instead of an automatic watering system you would most likely need more space. I used all of the dimensions given in the following video:








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