What was communicated to me through my build process:
1. I believe the consensus is to have it aligned with the end of the plastic belt.
2. Split rivets on AB/Kidney info is in the CRL "... equally spaced out along the depth of the armor and about 10mm from the edge. They may be painted white, or not. Note: For the original used TK armor, this type of rivets where, bifurcated rivets or split rivet."
3. I think this is a judgement call once everything is fitted to see that it sits on your body in the approx location to the screen shots. That was what was suggested to me during my build.
4. I went with 5, which worked for me. I would wait until you get the torso fitted and strapped and see what works best fit wise, I wish I had waited to the end to attach mine as I had to remove them (causing a crack ) and reset.