IMO, Canning's figures were placed a little too far inboard. I would move both a few inches towards their right. The large ovals represent the shoulders, not where the hips were.
I don't see how a bullet emerging from Kennedy's throat would end up between the jump seats. Only in a CT scenario.
You can't eyeball anything and I don't buy your graphics. You need to develop a more sophisticated 3D model and show the trajectory from the 6th floor of the TSBD in and out of JFK and in and out and in and out and into Connally. I'll let you get away with this if you have an exact 3D model to scale and you are very specific re the entrance/exit wounds. Short of that, you are wasting your time.
Note that you (or anyone) can also use the 2 laser challenge for 3 people.
First, line up JFK's surrogate to match the entrance/exit wounds, then remove JFK's surrogate and insert/fit Connally's surrogate into the scene and match up his rib/wrist/thigh relative to the MB trajectory (providing it was a straight line). Take photos of both surrogates and superimpose them into 1 image. Then note the body positions and look to the Z film to find the frame that best fits. Otherwise, a 3D re-enactment is the ONLY exercise that will advance this and it's cheap and easy and anyone can do it.
You expect us to believe that your CAD rendering is accurate and detailed enough to resolve the MB trajectory, which even YOU can't confirm is true. You are living in a 2D world projected from 3D via a physics engine. Lots of potential error with your methods since you are a CAD operator, not a geomaticist that knows how 3D->2D projection works.