Hi Necrobaron,
Here are a couple of sites that should have the information that you require.
www.fighterworld.com.au
www.australiasaviationmuseum.com.au
Try the Fighterworl site first because I know I've got that one right. Their site contains links to other sites.
Bruce LeCren a member on this Forum has helped restore a NA Yale and that is basicly a Wirraway from which the Boomerang evolved and due to the wartime emergency the instrument panel was transfered holus bolus and in a rush.
The Australian War Memorial, Canberra ACT should also have the details your friend requires. They have a web site but I can't remember the exact deesignator.
Hope that this helps.
Dai