Just doing some upgrades to the car... trying to get it a little lighter, better suspension, etc. Nothing all that drastic. You'll get a chance to see it sometime, I'm sure.
Ideally, the 5th point needs to be in a place where the belt can drop straight down from the camlock. Wherever that point is, drill a hole for the bolt, reinforce it top and bottom with big-ass washers or plates and connect up the belt.
I've seen people "wrap" the 5th point around the front of their seat... not only useless, but dangerous. The 5th (or 6th) point(s) are "anti-sumbarining" belts, which basically means this: it keeps the camlock and lap belts from running up under your ribcage when you get thrown forward from any frontal collision forces... it keeps the lap belt around your pelvis so that you don't slide UNDER (or submarine) the lap belt and do yourself more damage.
EDR