Hey there, I'm the creator of the old demo which is still available for DK1 + Razer Hydras. Due to it being built using UDK there is no simple conversion for the commercial rift. That said I'm currently working on a UE4 version of flight mechanics which will go into a more action oriented game. Stay tuned to https://www.youtube.com/c/getnamovr to get notified when there's something to show!