So I'm just finishing work on a semi-permanent grow box. I made the box 3'X2'X5'. I had originally intended it to be bigger but the roof in my attic slants down and therefore I'm limited a little in height. I cut the pieces into the right sizes and used 8 three way joints to make it into a box. I then made the walls out of a thick black poly. I just used tape to hold them into place. I then made one of the walls my door by putting velcro strips all the way up one of my 5 foot vertical pieces and on the end of the plastic piece. I hung my 400w mh by tying rope to all four top pieces and putting it through a pulley and attaching to my light (this way I can move the light in any direction by just letting out some rope or pulling some in). Finally I ripped down an old shitty dresser and used the pieces to nail down a makeshift floor since the floor in my attic is just insulation and 2x4's. I would have made a more solid box but I'm going to be moving in August and didn't want to waste a lot of money only to have it ruined in the move! Also I think the "soft" walls should make ventilation a snap. Any advice or comments are much desired kiss-ass