Hi Mordred, AJB. Thank you for your feedback.
No, not the gravity-drop concept. This guy Nick Korda wants to build 2 massive low voltage high powered magnets 50 m long x 30 m wide. He reckons if they are placed in a 'v' configuration, when they are powered -up they will draw gravity waves to towards them creating a zero-gravity bubble at the top of the plates. The YouTube link is
hxxps://yyy.youtube.com/watch?v=wXn0EpoZ16Q (replace xx with tt, yyy with www).
I think this thing will work.