I always see comments on YT about "if only we knew these lost secrets Tesla did", or "if only JP Morgan didn't sabotage the project, think of how the world would have changed!"
Well, the patents, including highly detailed instructions, have been online for at least a decade now. So, the real question is, why hasn't anyone built one? All of Tesla's patents are online, all with highly detailed instructions. If we could get this knowledge out there, maybe somebody or group of people with means and money could build one and change the world.
https://patents.google.com/patent/US1119732A/en 