I'm setting one up now. it's a cross between a colliseum style and using stinkbud's system of aeroponics. I went to Home depot and got a round tub. I've got four arms coming off of it made of PVC. I have them split into three "fingers". Each one has 4-1 1/2" Ys on them. Use 2" net pots and neoprene like stink does in the Ys. Use spray nozels for the roots. Hang the light down in the middle. I'm still building, but I think this is the way to go. It's less than 3'x3' and I'm under 6' for total height. will be able to grow over 60 plants after I add on, but I have 22 clones waiting to jump in it.