I remember reading about a 3d quad on rcgroups some time ago, there were no significant details just a low quality video and brief discussion but I wonder if that was an earlier prototype of this…
I have enough trouble flying the things right way up, even then if it moves at more than 5mph below 200 feet my heart is pounding its self out of my chest so it is not something I would likely need this side of the afterlife but it is a pretty amazing bit of thinking and engineering 