I just finished reading this thread in one sitting. Well written and informative. Superb workmanship!
One thing I would have done differently is to use magnets instead of rivets to attach the Kammback. Advantages: it's repositionable (so you can experiment) and nonpermanent (no drilling).
Available at Harbor Freight:
Rare Earth Magnets - Rare Earth Magnet Set, 10 Piece