Love the concept. It would be extraordinarily expensive with current technology, but in the future, who knows?

We first need a way to get mass (people, habitat, supplies, and equipment to bootstrap a space-based economy) into orbit cheaply. Rockets that expend 90%+ of their mass as fuel to reach orbit won't do it. We need something like a linear accelerator (and about 500 miles of right-of-way ending at a mountaintop for it to be human-survivable)

cool!

I don't know, they are talking about putting communities in the ocean, seasteading. Perhaps we should grab a few pirate ships and be an army of Dagnar's ......