What do you think about grow space setup?

I do not understand. Is the first closet just to keep the irrigation system dark? If it is to keep the solution in the dark, a black bucket might be enough. But if you want a double layer at that point you can use it to pass "cable hole 1" through there instead of over closet 2. As well as for "exhaust hole 3" possibly considering moving the extraction system in closet 1 thus gaining space in height (not by shooting the air into closet 1, but by having a tube that comes out of closet 1). In the end, in closet 2 you would only have the grow light and the carbon filter, while in closet 2 you would have the irrigation and extraction system that you could adjust without having to open closet 2.

LOl i love it! i was using Sketchup to plan out my first grow areas and plans for a grow box.. fun stuff. it's good that the rez is not with the light and the exhaust doesn't warm up the rez either. looks fine.. As much as you plan, when you are done there will be at least 1 thing you wish you did differently, lol.. can do that next time.. i have a pretty elaborate setup i use for 6months and take down in spring. Each year i take notes about what i want to change.. even order of how to set it up if it avoids a logistical problem etc etc... keep refining over time and it's going to be perfect. I've got full setup instructions down to where to run the power cables and what to plug into each of three 15amp circuits to make sure it's well spread out. notes on each light i won and what it needs for 16/8 or 12/12... takes the guessing out of it. My "Grow Bible" gets more refined each year.