Well done sir
It makes sense that you went this route with the coil overs in the rear and that is some serious beef that you built on that tower!
My plan is to tie into the tower at the shock mount similar to what you see in the front then bring something behind and to the side of the rear partition. Ideally I would like to be as close to the seat as you are but at 6'3" this can't happen. It started out as an idea for a harness bar but once I stripped the trunk I found that the right rear shock tower had damage it had been pushed inside slightly and somewhat concave right at the top of the mount a left over issue from the previous owner that had been in an accident and had the car half assed repaired. I never pulled a carfax so this lesson hurts.
