The round can give almost as much if planned correctly. If I ever build one it will be 12' diameter and will have a floor built 3 foot above the bottom. This will give you 3 feet of storage space and still give you 9 feet of head room in center. After putting bunks, and shelves on the sides you will have plenty of room inside.
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This is what I want to build.
http://www.atlassurvivalshelters.com/aboutus/nbc/
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