would one be able to use the bottom box as a ebb and flow system also? put a few inches of expanded clay pelets and a plant in rockwoll, set it up like a normal tray but have the sides much higher, and use the top the same way.just have a third tub for a watertank with a small pump?

if it would work i might try this out, i found a hydro fert kit for 30 dollars that includes everything Harrys Hydroponic Garden Center - hydroponics nutrients indoor lighting pumps are cheap and tubing is cheap so i dont see how this would be to much more expensive than this box setup.