[batsy71]

From the model showing in the video, the aircraft has 2 vertical stabilizer mounted engines ala trijets (https://en.wikipedia.org/wiki/Trijet). Barring some smaller jets, this design has ceased in most large airliners for multiple reasons, one of them being the crash of United Flight 232(https://en.wikipedia.org/wiki/United_Airlines_Flight_232) where the Vert stabilizer mounted engine suffered an explosive dis-integration which in turn structurally damaged the tail sections as well as its hydraulic control lines, rendering the vert stab uncontrollable.

My guess would be the present design has many more significant iterations left.