Thought some of you might be interested in the new greenhouse we're having erected. It has an earth floor since my wife wants to plant directly in the ground for the most part, is covered with greenhouse poly-film, and is 20' wide by 36' long. The unit is from Alaska Greenhouse out of Ninilchik—made right here in Alaska—their medium-sized unit cut in half with an 18' straight section between. The unit will be finished today.
I'm building the door because I wanted wood rather than the aluminum that comes with the model. The greenhouse has several windows that open automatically on heat-sensitive arms, and the ridge is vented through the cupolas. I'll also install gutters, piped into barrels on the inside. If all works well, the unit will vent and water itself passively, no electricity or water needed.
Will post more photos when the unit is done and will let you know how it works out.