vanHorck - I found that ridge OK in google earth but none of the background views match those in the crash photos.
I was wondering what could have caused the roof to blow upwards like that, rip out the roof pillars, and to eject the two seats. I reckon an oxygen cylinder blew up. Car bombs do the same thing - the roof looks curved. Must have done so after the impact because one of the seats ended up on top of the wing.