Again, very sad to hear of this accident. My thoughts are with family and friends.
I saw the initial advertisement for this aircraft and the photos appeared to show a very good build and finish - from photos only.
Having sat in a Soneria I found you do literally wear the aircraft.
Just reading back the many posts above, there appears that the pilot may have tried to reach open ground after a failure. The eye witness did not report any aerobatics, but rather a turn after engine failure?
I'm wondering why the focus of Rec Aus to its membership was 'a warning to its members regarding aerobatics?'
Again, time will tell, but an eye witnesses with aviation experience will be a good start point I'd think for any investigation.
RIP