I'm having trouble visualising the crash sequence. The aerial shots show the tail section on the other side of the ridge, with a channel carved out of the trees going from narrow to wide downhill to where the main body of wreckage sits. The wings are upside down, but facing down hill. Looks like the plane hit with a considerable wing down angle and "landed" on it's back. Perhaps a stall or in the middle of a tight turn when they ran out of altitude?