People can't wait for a bit of RQAC bashing can they?
Back to topic, I've been told the pilot was practising forced landings nearby (Kagaru?). Any chance carby icing or plug fouling after the long glide contributed to a lack of power during the go around? The plane has come down very hard - was it then stalled from the attempted go-around?
I think it is extremely unlikely there was an inflight breakup - the plane would be in many more pieces if that was the case.
The eye witness reports the pilot was out of the plane when he got to the aircraft soon after the crash - the pilot wasn't cut out. Although I doubt he was thrown '50 metres'.
Those questioning the maintenance, go to the CASA aircraft register and see who owns the plane (not operates it). The owner maintains their aircraft, and others, to a great standard.