Zappalin
I only have phoned and emailed operators in Queensland as said in a previous post. I am sure you have to rock up on Horn Island with those operators, Cairns as well. POM from what I have heard from guys who have been on that adventure, is to turn up,CP if not busy or out flying are happy to talk to you provided mins met gen 1000-1500+, and you obviously serious or you would not be there in the first place. I emailed the CP in Tropicair up there, will respond with realistic and positive feedback in terms of what he wants.
Round trip cns-horn-Pom is what I am planning. Might be a very good fact finding adventure, you may get something out it. Stay positive, keep your head down. All part of the fun and games👌👌