Yes, they do scale up. My current room is a scaled up version of that box more or less.
I used to grow outdoors gorilla style as well. When medical became legal here, I moved indoors and built the box I described. And then I bought our home we live in now, and I built rooms in a pole barn. And the same ideas went into my rooms. Electric up high, intakes low, exhaust high, plenty of plugs, insulate for noise and heat and the list goes on. But all things I learned on that box.
I lost entire summer time grows in the beginning too. I used a 600 watt light and our garage got well over 100 on hot days. So I had troubles with heat, and stressed plants are magnets for bugs. So I lost a whole crop once.
I learned compost tea is great for plants under stress, and if need be turn down lightts. You lose some yield but have heathier plants, with better buds. I also flowered at night and used multiple fans and ran a lot of air through that box in summer. And since I just grew for myself then, I would shut down from late summer until about October. I miss that now.
