Source of Ardupilot (Ardupilot Open Source) is suitably built for FlyMew hardware (RYA 2017)
FlyMew platform:
Ardupilot: https://github.com/PIFClub/FlyMew_Ardupilot.git
Radio Control: https://github.com/PIFClub/FlyMew_RC.git
Electronic: https://github.com/PIFClub/FlyMew_Electronic.git