It’s all about filling the space with plant(s). Then hitting them with a net and training them to form the desired canopy. Or at least that’s how I did it here. I’ve seen ppl fill a 2x4 tent with one plant. It can be done, and you can do it too! But it’s much easier with multiple plants of the same strain!
2x4s are tough. I’m still getting used to it after 3 grows. I came from a 52x52x80 that I only ever used 1/2 of, so I though it would be easy…not so much.
We have 2 5x8. I have one hubby has other. I grow the babies until ready to be scrogged. He’s a scrogger,! After that they go into a 15x15 flower room.