[toomuchtodo]

> I do wonder how this competes with straw bale / rammed earth, shipping containers, and other recycled, rapid prefab building manufacturing.

On labor? Much cheaper. And labor is typically the greatest cost.

[Turing_Machine]

In First World countries, sure. In Third World countries, maybe not so much.

A lot would depend on whether there was a local concrete industry.

Edit: I'm not so sure that this is all that "eco-friendly" either -- cement production requires a lot of energy.

That said, concrete is very durable (if made and poured properly) and might be a win in the long term.

[toomuchtodo]

I should have said "skilled labor". Also, while cement production takes energy, it can be made in a carbon-neutral way. I'd argue its a win with regards to longevity vs energy input.