If you are concerned about wind,Look for something shaped like a dome.. It's much more aerodynamic.. You could make something similar to a hoophouse.. There's plenty of ways to resolve wind problems.. But, as far as I know, not to many people have wind problems with normal rectangular greenhouses.. Joe

You make several excellent points, Steve. I appreciate the feedback. If none of these work out, I'll fall back on a 10'X12' Cedar-Built, which would probably be better functionally than all of these, but I just love the look of an octagon. I have a border with giant curves and a circular vegie garden in the center, so an octagon would fit in visually so well. One thing I'm trying to do is prove that a garden designed for birds, insects, and native plants can be beautiful as well. It would give me so much pleasure just to look at a beautiful gazebo among the lupines. I remember reading that one gazebo somewhere had a skylight option, and at least one vents at the roof, but I can't seem to find those in all my bookmarked pages. I've e-mailed all the sellers a list of questions, and I'm putting all the info into a comparison chart. Some give a wind rating, so I'll add that to my list to ask about. "Fortunately," I can't afford it for a year, so there's plenty of time to research it all. I'd like to use the GH as much as possible, almost year-round. I envision attempting the system Eliot Coleman writes about. I'd like to start seeds to plant out later, perhaps leave tomatoes inside all summer to protect them from the deer, add some long-season plants like peppers and melons, and start a second cool-season crop (maybe start them outdoors) to overwinter in the GH. It doesn't need to be fancy or pretty or roomy or comfortable inside for people, though. I'm wondering if an unglazed roof could be a net benefit, catching the winter sun but avoiding the hottest, most direct rays of summer. If insulated and vented, it could also help moderate temperatures in winter or summer. I'm interested in some solar panels to mount on the roof, like the 45-watt 12"X36" panel kits from Harbor Freight, to power a fan and lights. I have heavy-duty extension cords and an outside receptacle if necessary. I don't want to heat the GH, except maybe with an electric heater in a rare cold spell. (Since I moved back to Montana in 2009, winters here have been incredibly mild compared to 30 years ago. One year an early freeze made the brown leaves stay on the trees all winter. It was in the 40s most days, with hardly any snow; like a very long November. We went two years without getting below zero. It's been in the 40s lately and a some hardy souls have been paddle-boarding on the river.) Forever Redwood, with the #5 gazebo, replied right away, and they'd help me customize it. They mentioned making sure a skylight doesn't leak. Their cupola isn't normally vented, but they could make it vent, and there are three small windows near the top of the walls that open. Their glazing is bronzed Lexan acrylic. They also offer a 10% annual mid-winter online purchase discount, and a 10% discount for waiting 12 weeks for delivery. And you can choose from 3 different heights of base wall (24", 30", 36"). They're looking like the favorite at the moment. The one in the #3 photo is a strong contender, because it's delivered fully assembled. Their site used the word "insulated," so I'm trying to find out what they meant. And, as you mention, they have the most glazing (on 5 of the walls). The one in the #1 photo allows you to pay extra to insulate roof, walls, or floor. And you can get a cedar interior finish. Thanks again for your suggestions.

I like the first one over the second one because they'll install automated roof vents and an exhaust fan for you if you pay extra. Plus it's bigger for about the same price.

OK, no greenhouse kit suggestions? By just reading through all the posts in the forum, one of the most popular higher end greenhouse kits seem to be the cross country. The Rions seem to have their proponents and detractors. That doesn't give me a warm fuzzy feeling. I would be kind of peeved if I purchased a greenhouse kit for $3000 or so and had it leak or melt in the sun. For less than the price of the cross-country, my DH can easily build me one from scratch. Maybe that is the way to go. One more question if someone would be so kind....I understand that pressure-treated wood may cause some problems if moisture builds up inside the greenhouse and drips on the plants. Has anyone heard about using Timbersil wood for greenhouse construction? Here is a link that might be useful: timerbersil wood