I've been testing this for a couple weeks, and it seems to fly well.
Corrected a few things, but not much, until it came to the engines.
Stock version engines PT6A-27@620shp 50psi torque
Pirate version engines PT6A-34@750shp 60 psi torque (Viking DHC6-400 engines)
About 135MB download
http://www.prolectron.com/flightgear/dhc6p.zip
Landing lights require ALS and the rendering option stuff.
I use the PirateAir livery.
It should coexist with other DHC6 models. This uses a dhc6p folder name rather than dhc6.
It shows in the aircraft list as a DHC6-300+
Edit: Now on Github
https://github.com/SurferTim/dhc6p