Karen's right, it was built "from scratch." I think wind is pretty much an issue everywhere -- we had wind gusts up to 70 mph a week ago. It's bolted down to railroad ties.
Mac, I start most of my plants indoors too, but then move them out to the GH usually around mid April, at least a month before I could put tender things like tomatoes and peppers outside. (I previously had an 8x16 Rion greenhouse that I used for that purpose.)