Originally Posted by VictorVIcious

your second drawing is the correct one. You will want room to work around your plants and there isn't any reason you would have to space them that far apart. The only reason you would need pots that big is for soil grow. Seems such a waste when you have water and a drain available. The one thing you didn't mention, although I'm sure you have thought of it, is the electric. A word from a dummy, don't put you recepticles behind your plants. If you do then put switches for them some where else. And of course you would want to do the electric, plumbing, and ventilation before you put mylar or panda film on the walls.
I built my own flood and drain table to fit the space and lighting I have. Its 32" wide and 4' long, comfortable hold 20 plants under the equivent of a 600 watt light. Heres a picture of it full and empty if your interested. Ok, heres a picture of it if you are not interested. VV