This is how i see the damage to the skull .

Hi Rob,
Fantastic work with the Gifs.
Your graphic for damage to the skull gels with this John Mytton Gif:

I don't know if you've read the OP but I'm starting to get the impression the top of JFK's skull was blown upwards and outwards.
The massive flap of scalp was forced down by the side, and slightly to the front, of his head. The way the flap of scalp seems to hang forward indicates (to me, at least) that the shot came from behind - contrary to my previous stance on this issue.
Pat Speer has written a compelling piece on the subject at his website.
As someone who seems to have dealt extensively with the film materials relating to the assassination, I wonder what your opinion of "alteration" is?