Interesting piece but there are still a lot of technologies that need developing before anything like this can be attempted.

Space mining and manufacture being just two very important ones. There's no way we could send huge amounts of materiel up. But mining and smelting and using it there and sending stuff down is feasible.

Radiation shielding is another technology we could do with. Fuel collection and manufacture. Biological technologies to combat bone loss and muscle wastage...

The list goes on. But we are entering the age of commercialisation of space, so never say never.