Big fan of your helicopters guys, easily the best available for P3Dv4 and i really appreciate the fact you provide models for FSX/P3D even though the flight dynamics are not great.
Couple of suggestions:
The Bell 407 rotor RPM takes 42 seconds to wind down after throttle RPM has been rolled off, it irks me every time!
The AS350 exterior model could do with a touch-up around the nose, something I always notice when flying the aircraft.
The BK-117, for me at least is hugely FPS intensive in the VC, I raise this because most of your other models are extremely good on the frames.
Final thought, have you considered using your 407 to release a 206L? My understanding is there are only a few tweaks required for this…just a thought.
Keep up the good work!