Absolutely amazing video... this is the greatest achievement in the aviation industry for years.
To "Head Turner".. They say it is a serial B3, so that must mean it´s a standard B3 off the production line.
Fitting it with different engine or changing any power line components would mean it would have to be registered as experimental, which it was not, thus it must be a standard B3.
I hope mountaineers see this as a very postive thing for they´r sport since now perhaps it will be possible to rescue people from the mountain instead of leaving hurt or sick people for dead, since they´r fellow climbers are to weak to do anything except get themself to safety.