Kennedy was slouching. You're upright, maybe leaning backwards a bit. You also need to have the laser at the necktie knot level.
The problem with this sort of experimentation is that it's a unique moment in time that has to be duplicated. On either side of that mirco-second immediately begins a million different ways that depart from the unique moment. Kennedy and you have different physiques. The odds are astronomically in favor of the duplication being a failure.
The "back wound" autopsy photo was taken as if from above the level of the wound. The lower back recedes and the head towards the top of the picture is noticeably larger. This oblique view, along with the shoulders raised up due to rigor mortis, make the wound seem lower than it was.
The lower part of the ruler rises away from the back. If the wound was in the back, the whole length of the ruler would be flat against the surface. Instead the ruler is pressed against the area where the back curves towards the neck. The level of the skin bump caused by the scapular spine (the scapula bone is raised along with the shoulders due to rigor mortis) support the entry wound at C7 level.
If you say so. Your superimposed skull and spine graphic was scaled incorrectly and cannot be used as a reference. I also have a photo showing the laser dot on my bare neck at C6/C7.
I also tried flipping the reference to the back wound and putting the laser at T1 to see where it exited with the front laser. You guessed it, below T1 and well below the knot. And the magic bullet definitely went as low as T1.
http://www.kohlbstudio.com/Images/x-ray_mb.gifI repeated the experiment for every conceivable position and the only way I could match the wounds was when I was bent forward almost to my knees. The front laser barely cleared my chin. Only then could it have struck JFK in the back at T1 and exited at C7, but JFK wasn't bent forward, let alone to his knees.
You can't fold your spine by slouching and you can only rotate your spine away from the MB's trajectory to have the entry wound lower on your back than the throat wound.
Not sure what your graphics are supposed to show but they can't show you what the the lasers can, which is an accurate 3D rendering of the experiment which even a layman like you can take to the bank.