No it wasn't a rock, nor was it my head. I drove it along a farm track after it had been sitting all day at work on a 36 degree day, when it got a bit of body flex and the glass just exploded, the window did get hit with a stone in that area about 2 months back tho but couldn't see any damage then.
Mark, I have taken it on 3 X 280km return trips down to the Great Ocean Road now and it hasn't missed a beat, runs really well along the freeway and is a pleasure to drive. just a few teething problems I had to overcome but now all is sweet as, so no yellow paint for me!

Still having dramas with vicroads trying to get the roadworthy sorted,