I would appreciate a pointer to those references -- my only reference states that according to the test pilot, he "MAY" have briefly gotten slightly off the ground, but felt that it did not really qualify as 'controlled' flight.
(edit) Again, though, the point is moot in Nostalgia -- You would give up your Nostalgia points, since there are no Class 1 or Class 2 designs of this plane from before the cutoff date (known, at this time). Nostalgia Profile has no scale points, so it doesn't matter if the prototype ever flew or not, or even if there was a prototype. We already have a Nostalgia era profile.
If one were to consider building a present day version, if the 'successfully flown' part could be verified, one would an engineering nightmare, although John Vlna has suggested that it might be do-able with electric power.