Better late than never. It would only be fair to share my experience, as I got so much help from here.
I ended up doing my trip already some time ago, despite some small problems in Port Moresby(well, what can you expect?), I got back home in one piece. In the end, I only visited one company mentioned in this thread, but I don't know whether that will materialize or not. Hopefully, but I don't know if I made a positive impression or not.
Another company which may have been worth visiting had an accident a couple of days earlier when I was there, so I figured the CP has more important things on his mind than me.
Am I crazy because I much rather want to get a job in those parts of the world, instead of having to stay in Europe?
(<--Why does pprune have a emoticon which is chewing areca nut?)