Jack,
Wouldn't the relative seating orientation of Connally also be important to the laser demonstration here besides only showing the angle was 16 deg.?

Yes, the seating orientation of Connally is crucial. Also, the angle was 17 degrees. My point is that it is up to YOU as a surrogate to orient yourself any damn way you please to make the Magic Bullet work. You can slouch or bend forward anyway you like as long as you match JFK's body orientation at the time the Magic Bullet struck him.
You can include Connally into the mix if you like and I can show you how to do that once you get past the Magic Bullet's trajectory thru JFK. The lasers are just a tool to determine the entry/exit wounds of the Magic Bullet, which none of the ballistic experts bothered to utilize in their analyses. They are given way too much credit to sort out the geometry involved. They typically aren't physicists who can calculate bullet trajectories.