ok so i was outside in my shed (building my grow box)and i ran into a lil prob. my shed is 10'x20' but as i was getting started i realized my plan of a grow box wxdxh(5'x3'x6'). but my question is how deep do you think it should be, as the 3' deep kinda takes a whole lotta space protruding from the wall. i just need to know the depth i would need to fit 4 plants? any help ASAP would be greatly appreciated!!! this is my first grow and i want everything to be perfect.