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 are using a rototiller, you are doing it wrong. Even on this tiny ad:
It's like binging on 7 seasons of your favorite netflix permaculture show