Shit is gonna be sweet..swizziiiit. I ran a sealed room for a little bit, only 3500k, but still a grow. I have been checking out the pics of this set-up, and i wanna know, do you have passive air exchange in the roof of your barn. I see you put insulation on the roof trusses. A cieling below that with insulation on the top. Then you can put air exchange holes with screens in the gables. If not, like me your gonna have problems with negative pressure and big time condensation in the building. A giant dehuey will solve this, but then it has to work almost all the time. Having the ceiling/roof set up like a house is the way to go.(I learned this through trial and error). I would paint everything white, then go the orca route, then when shit happens(bugs, mold,whatever) the walls are already white if ya have to take down the orca.Man your making me wish i still had my old spot and set-up. Keep up the great work