I didn`t have too much time to test VPN functions last time. Overall services works well on both configurations: RPI 3 and RPI0w. Maybe It`s not perfect but it works
Following test was done using LTE connection and Aruba services.

As I said It works and it not require public IP, this is probably the most important fact from this movie. Telemetry looks very well but in the case of video …. I need to find better VPS servers or other streaming options. AirPI control ( first part of movie ) works not so bad but Qground Control is not acceptable as for me now. BTW I need to ask UAV matrix to add this function to software package I think it can be good solution for future.