The "prefab in a day guy" did build a 15-story hotel in two days: https://en.wikipedia.org/wiki/Broad_Sustainable_Building https://en.wikipedia.org/wiki/Broad_

The "prefab in a day guy" did build a 15-story hotel in two days: https://en.wikipedia.org/wiki/Broad_Sustainable_Building https://en.wikipedia.org/wiki/Broad_Sustainable_Building He's now trying to build the world's tallest building with the same method, and while construction hasn't started, it's a lot less vaporware than this high-speed rail project: https://en.wikipedia.org/wiki/Sky_City_%28Changsha%29 https://en.wikipedia.org/wiki/Sky_City_%28Changsha%29