The first Australian designed aircraft flew on 16 July 1910, 16 years after the first flight by the Australian inventor Lawrence Hargraves on 12 November 1894.
In turn, both Duigan, a Victorian farmer, and Hargraves were familiar with the flight properties of hunting and returning boomerangs of the first people.
I have been collecting plans and related material to attempt a scale reconstruction (presently underway, details here).
The image is based on the Lewis replica donated to the Victorian Museum.
I should note that my friend +Chris Sutton has pointed to the efforts of the New Zealand inventor Richard Pearse who may have been the first person to fly a powered heavier than air aircraft.