G'day Syc,
I was approached by a Police investigator who mainly covers aircraft fatalities. He and the ATSB are of the opinion that the wing departed first at the upper wing attach point. CASA posted a recommendation to all Aussie Strikey and JP operator to limit the g to +4 and no 0g or negative, which is what I flying to for the past 5-6 years. Pax don't need anymore than that to get the thrill.
There is a theory that the aircraft had main gear collapse years ago which may have weaken the wing attach lugs.
I will PM you what I know about the rest. If I can find the prelim. report, I will PM the link as it has photos of the sheered wing attach lug.
Usual problem with sort of thing is sifting through the crap and personal agendas to find some true facts.
Cheers MM