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It looks like a potato. It could provide a good emergency shelter in time of disaster. But it must be pretty heavy--not really for typical camping out.
Such devices are portable. We had a friend we worked with who built a concrete boat as an ocean-going vessel for an around-the-world tour. I guess it is easy to build and very seaworthy. The largest was the 345ft long, 48ft wide, 26ft 7in high Gu Tian.

Building with concrete is easy - but the chemistry must be engineered correctly with the right support structure.

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