Have had a few successful flights now with my VTOL converted nano drak:
Steve Carlson gets the credit for the tilt rotor design but I adapted it for the nano drak and added a tail motor mount.
The STLs are here: Nano Drak VTOL by appelm - Thingiverse
I have converted a couple of planes to VTOL including the Heewing T1 Ranger and the Ritewing Nano Drak and found a lot of others wanted to try doing the same. So I setup a Facebook group dedicated to these conversions and potentially other hobby planes. Some discussion of Ardupilot VTOL setup is obviously part of it and so would like to invite any hobby VTOL experts here or interested people to join: VTOL Hangout - Nano Drak/Heewing T1/ others | Facebook