As you build this I would plan for the fans and fresh air intake, heat venting exhaust, light proof entrances and exits of air, and circulating fans....there WILL be some heat generated...and lastly, the stink. Fresh air is very important to these plants when growing indoors, and the stink will get you busted as those guys found out in NoCal the other day...cop walking by a warehouse smelled weed as he walked by...and definitely do a dry run to ck everything before you actually grow! G/L!