In regards to what is interchangeable with the Boomerang and Wirraway - very little. True, the design brief at CAC was to use as many Wirraway parts as possible, but just about everything was strengthened and/or modified. Even the wheels were modified to try to reduce the drum brakes fading - these wheels are now extremely rare to find in airworthy condition. I am pretty sure that this aeroplane has a much modified Harvard Mk IV wing centre section, new build wing outer panels, but otherwise its all Boomerang. The fuselage frame has been modified to take a second seat and it is definitely not a T6 frame. Check out this
http://returntoflight.aviationadvertise ... o-library/ for some great detailed photos of a very nice resto and to give you a clue to what a real Boomerang looks like on the inside.
Congratulations to Matt Denning and his team for another successful and beautiful rebuild.
Edit: Spelling mistake - Doh!