Thanks Pete, scary memories I didn't need, I spent a fair bit of time up in them thar hills in the early 90s, working for Curtain Bros, every landing was an accomplishment all on its own.
Used to fly survey in PNG, but low level stuff. The company had a Beech Baron with twin 380HP engines for the high stuff. One pilot's eyes popped at god knows how many feet, (unpressurised) and the aircraft was saved by the navigator. That aircraft (Aero Commander) probably still has the stress marks where the fueselage/wing meet. We all knew enough to come close to landing the things without killing ourselves.
Actually, Fairchild is building them, mostly for military use. The turboprop version, under license from the Swiss. Not too many for general avaition. I have flown on several "Continental Air Services" Porters, a long time ago..