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It is interesting that surface areais so important. One way to make a cold saferoom would be to get two sturdy dome tents, one about 4 foot less in diameter than the other. Set up the smaller tent inside the larger tent, and fill the space between with insulation, such as celluose insulation. Beef up the inner tent structure with additional fiberglass rods or pvc pipe. Put the tent on an insulated platform and access it through a trap door on the bottom. Instant Igloo!
In any case, both for thermal efficiency and material cost efficiency, a dome shaped structure is required for extreme insulated structures. At least, as long as you can cut the pieces of the dome out of the material without a lot of waste.
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