Make on from a 275 gallon tote
Cut the top off at 24 inches, flip it upside down, put it into the bottom of the tote and that's your soil container. It already has a 6" hole in the middle. Could make a giant peat wick there, and run some thick wicking rope out like spider legs. Give you about 130 gallons of soil, and a 50+ gallon reservoir depending on how far down you brought the soil container into the reservoir. Put some air disc's in there, and grow some monsters.
Would definitely need 8' ceilings