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You may want to search around a bit, but I'm pretty sure all the tent shelters like these that I've seen in winter are round. They usually look a bit more rounded than the 'round' ones on that website, but similar idea. I know I've seen some of them that seem to be made of the white plastic material that you'd use to wrap a boat for storage. I have no idea what kind of framework would go under that or where to get it.
Sorry for the minimal help, but I'll keep an eye out.
-Justin
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