Here's a couple of picture of my 4x2x4h tent. It has the same Mars Reflector 144x5w light. The two plants are hanging out in there and will be moved into my flowering tent as I harvest the plants in there. They are in 10 gallon pots. There is a three gallon pot in there for size reference.
This next pictures show what four 3 gallon pots look like in the tent. The plant in there is the clone I'm sexing in the flower tent right now. It would easily fit in the other end of the tent where the pots are staggered back-to-front. It's an all sativa plant so doesn't have the fat leaves and tight nodes of Smokey's plant but is basically the size that Harley and Casey are now.
When a plant is introduced to the flowering tent LST will be useful for pulling limbs so the plant has a rectangular shape. There is 24" of room from the front to the back of the tent for each plant, but only 12" of room side to side.
Does that make sense?