When the Bigelow inflatable space model went up on the second try at the Space Station it proved an important derivative point; inflatable building forms-for example a sphere, could be used in zero gravity or on Mars and spray coated or rolled with a permanent adhesive substance. Building thousands of empty space spheres for various living purposes easily and at low cost requires the invention or application of the right materials for zero-G, Mars and the Moon.
Inventors and governments cannot always have classified insider documents go to currency speculators via blackberry and guarantee booming financial success. Even when a Yoda-breaking-bad to the dark side of the force doesn’t work to finance pioneering exploration work investors periodically appear to fill in the gaps.
The inflatable Bigelow inflatable module showed it works outside the Washington D.C. beltway in the micro-gravity field. One would like to see inflatable building forms develop with field testing on the moon, Mars and at the Space Station. Making the special strong-lightweight coating that can be applied at near absolute zero and yet will harden to make a strong-permanent building shell should be something easy of materials physicists today.
I have read somewhere that aluminum naturally welds itself in micro-gravity. Maybe ground ground up aluminum dust coatings have potential as a building shell coating.
Inflatable forms could be scalable to very large sizes. Complete sphere could have exterior connectors to other spheres and even low-cost ion engines to speed them around the solar system as working, transport, freight, agriculture, research and habitation and storage modules by the hundreds of thousands.