I'll have to measure it tonight or over the weekend, but that wouldn't be a problem. It's almost silly how easy it is to
It did pretty well closed up; I piled snow onto the snow flaps, so I had no draft, but I did have frost on the interior. It ended up being a calmer night than I'd anticipated, so I probably should have opened the top of the doors a bit.
I didn't think to show them in the video, but it also has peak vents, one at each end, in addition to storm flaps on the zips. I suppose I ought to do another video, but I wanted to show it in the field rather than in my back yard. :)
I haven't had a chance to use it in summer at all yet, let alone above the treeline, so I not yet on that part.
It does have tieout loops on each peak, so you can use trees, trekking poles, etc to pitch it rather than interior poles. It also has tieout loops on the vents, which I suppose would be nice for truly stormy weather, both to keep the little beaks over the vents from flapping, and for some extra stability.