When this all started, i was at least optimistic. What i underestimated was the actual scale of pent up investment dollars available once it showed any sign of working.
Now we have the Space-X heavy and it magically uses stainless steel as its structural material. Of course! All those half a magnitude gains provided by exotics are irrelevant when you increase your operating scale by a magnitude or two. What matters then is buildability. The Heavy can now loft a rail car worth of goods into orbit.
It is now completely possible to quickly build a orbiting Dyson sphere in Earth Orbit. Such a sphere would have a central tube axis able to dock incoming craft and to even house then for the purpose of off loading. An inflated balloon would then be used to secure a shirt sleeve working environment for the structural build of the space Station which may well be a mile across even. what is important is that we use suspension cables turned around the axis to hold platforms forming the outer working shell of the Dyson Sphere. Rotation will then produce a natural local acceleration on the platform equivalent to Earth gravity. Thank you Newton..
Entrepreneurial Space Revolution