Hmmm, so I'm aware that a significant difficulty in normal concrete construction is ensuring that all the concrete gets everywhere it needs to go - and that's w

Hmmm, so I'm aware that a significant difficulty in normal concrete construction is ensuring that all the concrete gets everywhere it needs to go - and that's with relatively direct access a lot of the time. I'm also not entirely clear what the saving is here - you still have to get concrete from somewhere to the construction site, to somewhere that presumably already has some local material that could be use instead? Also if it's just making a box, that's not the problem - people have already have shelter. Where things break down are access to clean water, food, and similar. But I guess those don't sound sexy and so don't get funding.