Quonsets have been covered in bags. Barrel vaults with decent spans have been bagged with strong permanent formwork. With temporary formwork, can't really vault much over 6', 8' with double bag wall to butress lateral thrust.
Or bag vertical walls and frame or ferrocement a vaulted roof
If you're gonna buy things, buy this thing and I get a fat kickback:
grow your own garden and build your own home in the gardening gardeners program
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