Sounds about right to me, gman!
I think, though, judging from the daylight in the Perth cabs, they'll bunch them at the bell tower in the wee hours of the morning and everyone will proceed together to the airport to catch one of two charter flights. Getting everyone to the airport by 12:20 seems just a little snug to me if I'm TBTB...
Also, the croc task is almost certainly a detour option and the didjeridoo (sp?) a roadblock, agreed?