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Hmm. - my friend must have had a rare setup - I can't find any images. The idea is to use arches with a shallow channel to support two layers of poly, with a tensioned member over both layers at the ribs, drawing them down into the groove. Air is blown into the space between layers of poly to separate them, and give the general topography of a cheap, stitched sleeping bag. The inner layer bulges in, and the outer layer is all convex. Being taut, it won't flap in the wind. More layers could be arranged. Air-supported buildings are rather wonderful, but different, requiring an air lock entrance.
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