How do you think he achieved this rear drop?

yeah, I picked up some MP .92" T bars to replace the stock .85" (pretty close to the fleet/HD/Police .94" bars listed in my FSM).....I'm holding off on buying rear springs until I get the front done and see where the front feels/looks as far as ride height....

That's certainly an improvement but really with a decent set of shocks I wouldn't run anything less than 1" bars in the front. That's still only like a ~200 lb/in wheel rate, which is still less than the majority of newer cars. Unless of course you're planning on running bias ply tires.