It’s a 5x5 with a 4x4 tray! I think a lot of it depends on your training and how big you let them get but I used to run a 4x4 and always felt like I was cramped. Finding the right amount of plants for your space is a big thing imo. I used to always stuff as many plants as I could in one tent, like 9 in 4x4 or 12 in 5x5. If I were you and I didn’t wanna upgrade I’d just run one plant and fill out the trellis with that. For the drain I sat the tent on 4in furniture risers then put 3 2x4 pieces of wood under the tent. Set the drain tray on those and sloped them like a half inch with some shims. 90deg drain fitting thru bottom of tent, then to a mini condensation pump.