I'm glad it helped.^^^ really nice write up.
Which latch points? The only mounting points in the rear that I would attach a harness to (absent a bar obviously) are the rear adult seatbelt mounting points. Those are the only places with enough strength to survive a crash and properly restrain you with a harness. You'll notice that the rear upper seatbelt mounting point is nothing more than a re-direct and the reel is mounted down low.Are there any harnesses that clip into the factory latch points in the back? Or are those not strong enough?