The ribbing where the fabric is stitched forms the load bearing members of the structure.
When it is done, the shell is the load bearing part.
And wow, call it a 'bomb' shelter. But it's not proper evil genius without an underground complex.
Concrete has enormous compressive strength, good but not great shear strength and very weak tensile strength. Add wire or glass fiber and suddenly you have super-crete.
I learned wire and concrete in design school. Less than 3/8" thick welding rod, stainless steel screen and concrete easily deflected a 2 1/2 lb sledge on a 2 ft wide model. Tubing, chicken wire and concrete has been used to make ocean-going 40+ ft boats with 3/4" thick hulls (except where the 2 1/2" tubing was). The stuff just gives and flexes back. If you break it, you push the loose stuff out and patch it with concrete, which is kind of like what you do with a fiberglass canoe that's been slammed into a rock.
I have to wonder how thin the glass cuttings and concrete can go. It might work for enclosures and it might not.
Oh yeah, use driveway sealer when you're done. Concrete needs some water (the term I was given is water of hydration) to maintain bonds. If it dries out, it loses strength.