I know this will be a lot to read without visual aids so if anybody does read this please forgive me...I don't have a scanner to upload my plans. I will be heading to my local mega hardware store in the next couple of days to buy the materials for my grow box/room and was wondering if anybody had any suggestions before I started. I am working with a walk-in closet and will be building into a corner of the closet a grow box. The dimensions are 3' by 3' and 7 feet tall. I plan on building a wooden frame with two of the 4 sides up against the corners leaving two exposed. The remaing sides will have removable walls made up of thick sheets of cardboard (courtesy of wal-mart's pet section, they use them on the bottom of pet food pallets) that will be fastened on by a complete surrounding of velcrow on the frame. The floor will be wood covered with mylar and the top will have 2 hooks for (my 400w hps/mh) which will be screwed onto the frame for a complete seal. For ventilation I have decided to go with two 9 inch high velocity fans, one on the bottom for intake and the other on top for exaust. Both will be connected to a removable wall via air duct tubing shaped at a curb to help reduce loss of light. Everything will be covered with mylar all the way down to the tops of my Bubble Buckets. I plan on using a remote thermometer with the sensor in the box so I can get a quick read without constanly opening it up. My apartment is equiped with a heater/air conditioner if temprature manipulation is required. Haven't thought about humidity control (if it's needed)...maybe you can help. This will be a one time grow (for now) and don't require seperate space for clones or whatever. The box can be expanded up to twice the size if needed but I only plan on growing about 3-4 femenized plants. Hoping to yield enough to cover the cost of the box...which isn't really expensive. For personal use only...not looking to get a massive amount as this is my first time and I don't sell anyways. Oh yeah, fresh air will be brought into the walkin closet via box fan. Uh...I'm sure there are some things I missed but you can pose any questions to me if anybody bothers to read this. Any help will be appreaciated. Thanks.