Concerning the greenhouse vs. shaded carport....
He (double) was in northern cali, and growing from May until October, so no freezing temps, I have mine in a greenhouse because Im flowering outside right now and will continue to flower outside with new plants until April. So, from December until March the temps can get near 32 degrees at night (freezing), and with container plants above ground, I dont want any of the roots with moisture from waterings getting froze to the point of death. The greenhouse captures the sun rays during the day and makes it atleast 15 degree warmer than outside, and with the enclosure we can put a space heater in there for really cold nights. Doubles plants grew when it was warm out so there was no real benefit to having them enclosed. I believe his containment was more to hide the 12 monsters in the backyard from other peoples eyeballs. While my green house is to keep plants from freezing, I also have a flap that I can open to let air in and out if I see moisture building on the walls but to be honest I need to put a hygrometer/thermometer in both my veg house and the flower house, TODAY!
I use clear plastic for the flowerhouse with black plastic roll downs at night time for the extra insulation, it also keeps parasite light leaks out, because after having some plants make loose flowers because of landscape lights and street lamp intensity in the neighborhood, I wanted to ensure the buds were darked out at night. My veg chamber just gets black plastic because I roll it up during the day for sun exposure and more importantly I am trying to keep the heat in the chamber that the two HIDs make for warming purposes during 40 degree lows and more importantly to keep the 85000 lumens from blasting the backyard. I will take pics of both today. sorry double, I just wanted to chime in concerning your enclosure and privacy.
If you people will really keep this as annual event. I promise there will come day I will manage to meet you up. But now still growing my second grow in tiny closet. But it's only second one 
