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What if you wrapped the pipe into a torus, giving you the extra side strength and aerodynamic properties of a dome. You could perhaps build a fire or heater in the middle of it, heating the hoop evenly. Just drop a glazed donut on the ground and you'll have a precise scale model. The cool part is that you might not have to do much with it, besides make some sort of a door. Snow or mud would pack around the sides, so I don't think it would slide around too much. The culverts like used in large sewers should be flexible to a certain extent, maybe enough to form a hoop.

Offered by Joe.

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