So I am going to keep it simple for my first round. I figure that I will frame out a perfect cube, 6.5' x 6.5'. Basically 2x4's with plywood paneling on the inside (completely covered with mylar sheeting). On one side I'll obviously frame out a small door so I can get access inside, and on that same side at the bottom right or left I will put the INFLOW fan (or should it be in a different place?). On the top I will have a climbers rig to hold two chains going to the middle into two holes to hold the HPS inside, and so it is adjustable. Also on the roof I was going to put the OUTFLOW fan with some form of odor reducer (don't know yet ... don't understand all the filter nonsense and ozone stuff yet). The only real issue I have is whether I should frame out a floor or let it rest on the cement flooring already there. I am tempted to even go the extra mile and frame out a floor and possibly seal up any joints as to decrease access from the outside environment except for the fans and my entry way. Anyone have an opinion on this? Is 6.5' x 6.5' too big / too small? I was looking to hold 9 plants (indica/sativa hybrids). Lookin' for advice because I definitely am not the best carpenter, but I have all of the supplies at my disposale for essentially free. Suggestions welcome!