The Islander and Trislander used to be a common type endorsement. About as similar as a Bell Huey and a Caribou (both green!)
From memory, the correct model for the two (?) in Australia is BN2A-MkIII, not BN3 and both have short noses. They are both ex Bush Pilots Airways, Douglas Airways and Cape York Air. I'm surprised they aren't out of wing cycles?
GAMAN, do you really want to go there?