Griffo...you may be right. crack, delamination due old glue, may have got that wrong. Was by the cable hole the starting point ?
I was told the story many years ago, of that accident by the Tiger builder who used to live at Northam WA and was involved in the investigation...I guess it must also be in an ATSB file someplace.
Local hero since passed pioneered air ag in FNQ starting with Tigers. Crashed a few, one into a big tree and survived. "Hairy" anecdotes abound.. All part of the individualism of the early solo operators, living on their 'edge'