
There are inconsistencies between your different views and the photos. As you point out, you need to raise JFK's shoulders in the rear view to fit with your lateral view and with Croft and Altgens' 5. You also have JFK with his ribs pressing against the side of the car, which does not fit with z195 or z225. I would place him at least an inch farther left and probably 2 inches. His right shoulder is definitely inside the car because the upper arm is extending outward from the shoulder to the top of the car:

JBC is also a tad too far left. The top rear corner of the side window is out of place in your drawing. A sight line from the top rear of the side window frame (connecting the roof support) passes to the right of JBC's nose in Altgens' 5:

You are also using an angle from the SN to JFK of 8.5 degrees.

Even at z223 the right to left angle was 9.9 degrees:

At z188 the right to left angle was 16 degrees:

If you use the angle at z195, which is at least 13 degrees, and if you move JBC a bit right and if you move JFK two inches farther left so his rib cage is not pressing against the side of the car, the path through JFK's neck goes to the left of JBC's spine. With JBC turned right as he is at z185-z200 the shot through JFK would hit the left thigh if it was out to the left as it likely was (he would not sit as you have him with his legs together).