There is a book on building UFOs - I have a copy at home, but not here- and the illustrations look similiar. The book is considered a classic in the field,, the field of building flying saucers (maybe that's not a field, more of a patch) .
Anyway the science is similiar too.
My point is - the concepts have been around for a while ( at least since the 50s and 60s ) and it has been proven to "work", but for very short periods of time (seconds and minutes) and very, very low levels of elevation. Power is the main problem,,, the "crafts" also weigh so much, that once they decide to stop defying gravity - they fall rather fast.