Pot size in grow box

So i got a small grow box roughly 2.5H,2 foot width and 4 foot width. This grow box is in my main bedroom and i only want to grow one plant for personal use, I plan on growing pineapple skunk but should i use a wide plant pot since i have a larget amount of length while the plant itself must stay under 2 feet, any tips on how and at height should i scrog my plant so i can get maximum effect.

Would you say this is roughly around the same size as a 50 gallon storage bin would be?

Yeah about that size