"Another aeroplane, which has a history of wing structural problems is given approval to carry a 100 kg overload, despite the recommendations of the maker."
If you are referring to the Shrike, the Australia only approved overload VFR is closer to 400 kg, almost a 15% increase on the manufacturer's MTOW - despite two catastrophic in-flight failures in Australia in recent years plus a further twenty overseas!!
In respect to the Lockhart River Coronial Inquest, I suspect Counsel Assisting engaged the services of
this consulting firm, which would explain the presence of it's principal at the Inquest.
Unbelievably arrogant!