Despite the National Geographic article, I still don't buy it.
The hood of the truck is deformed and flying like after a violent side impact, the front cowling is not deformed at all, not a wrinkle to be seen. The propeller is not bent, meaning it wasn't turning on impact. Even if you come at idle, let's say 1200 RPM, it's still a 20 rotation per seconds.
As far as the trap door, I flew with it unlatched on my 210, and it ALWAYS stayed up banging on the cowling in flight, it never went down.
For the elevator, maybe you are right, the pilot didn't have a shoulder harness.
The propeller is in the "typicall" attitude of a on the ground stopped engine. After a flight, when I shut off the engine, I have to rotate the blade 20-30 degres to put it horizontal. (company thing to indicate that the plane needs fuel)
I don't by it, sorry National Geographic, I just think that someone found a way to make money in the 80s.