I use 18" diameter 5/8 plywood bases painted white and nail 62" of 2x4 poultry wire at the bottom using poultry wire surrounds. 62" allows for each end to have bare-wires. Those wire ends get rolled into circles. Those circle-ends can act as latches temporarily, until foam-wire secured. Starting at the opening, I nail a 3/4" staple at the second panel from the opening, and another staple on every 4th wire for cage stability. Before I make-up the cage, I wrap four turns of foam-wire in at least (6) places around the bottom perimeter. This sound-deadens the contraption, so when rolled across concrete it isn't as loud as a metal garbage can. Initially close the opening with foam-wire pieces, and the wire enclosures can stay for easy access. Access holes are also snipped at the 3rd or 4th pane on each side of the cage, and another access hole snipped in the back perimeter opposite the front opening. Any number of supports can be hung from the wire cage rim, yo-yo's, extra stringers across the top. Having the plants on caster bases is a good thing in veg. "But in flower, the plants don't like being moved", it's said.
Also, when the access holes are created, I file smooth the wire-ends and coat them with RTV silicone, or you will tear your forearm reaching in eventually.
I have a 0.28Amp fan at the bottom of each of the four corners. I have no fans on top, or on the side, only the bottoms of the leaves get direct air. Every leaf moves 24/7.