This is one hell of an epic thread. I remember cruising through the first 15 pages when I joined here and thought, "wow I should just look through here for vacation ideas."
Now I realize, I just replied to your thread on the E38 forum about this car and suspension stuff. TL;DR over there = get some good progressive lowering springs to pair with the Bilstein's and it will have the response and firmness of the ZHP without harsh bumps. Go Sachs or Bilstein touring if you want softer. New control arms front and rear are mandatory for tightness. Edit: just realized 77k! Those arms may not even be spent yet at those miles
Good luck...I guarantee you're going to find more interesting stuff based on your video... Check the ABS wheel sensors for some interesting repairs. I feel like those are some of the first for cutting corners...
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 111k
'98 740il | Schwartz 2 | Sandbeige | 5AT | 238k | lowered on Bilsteins w/ B&G springs
'00 540i sport | Titanium silver | Black | 5AT | 120k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 215k | one owner, all original