Well I'd rather not build a wall down the middle because it's going to make it a pain to get into the main grow area. I'd like to keep the brown sections for 100% grow space (think of those as tray sizes or whatever)
The tents were mainly just to make things a little tidier and so that I can freely work on any section without having to worry about day/night cycles but I do know how to frame. We actually built wooden tables inside of my old tents and it worked great but tents can definitely get a little expensive.