Trojan's experiment is right out of Rube Goldberg.
Imagine using a protractor on a laser. And do you need positional mounts for the lasers? Do you mount the back laser on the wall or ceiling?
Instead of two lasers, you only need one. Position the laser and take a photo with no one there, and without moving the camera, take another with a person breaking the beam. Then superimpose the pictures.
But first you need to measure the laser beam angle on the photo until it gets to 17-degrees, assuming the camera is at a right angle to the laser beam. That's just the technical set-up. One has to figure out the posture requirements, which renders the whole experiment subjective.
Jerry, why aren't you getting this? The set up couldn't be easier or clearer. You just need to understand geometry a little better than you do. You can easily angle the low laser 17 degrees by using a tiny bit of trig to work out the opposite and adjacent sides of the triangle. The opposite side is where you position the high laser and you position it exactly where the red dot from the low laser strikes it. Then you aim the high laser at the low laser so that they have a coincident alignment of their beams. With this the set up is complete.
And yes, you do need 2 lasers to simulate the straight line path thru your body to identify the entrance and exit wounds. You can't do that with a single laser because you need simultaneous red dots on your body estimating the MB wounds. You certainly can't take one photo, move the laser and take another photo and expect your body to be in the exact same position as the 1st photo. Comprende?
When you find a solution that works fine, note your body position and compare that to JFK's. If you think you have a match then post the results and make me eat crow.
2 leveling lasers cost me $35 bucks, I found an old protractor from grade school (even though you can use trig instead), I used a camera tripod on a table for the high laser and it took me about 10 minutes to set the whole thing up. And after many minutes of work, I just couldn't make the MB work for me. Maybe you will have better luck. As for JFK, he must have had a grossly disfigured spine or he was bent over so far he could kiss his own ass goodbye.
We can poo-poo each other's graphics until the cows come home, and rightly so, but you can't effectively argue against a re-enactment with a surrogate based on valid geometry. EOS.