Here is a simply amazing restoration by Pete of an SB-1000F (fretless) that had the original pickup removed and two jazz pickups installed.
Pete managed to do the routing and accommodate two Armstrong SB replacement pickups, and then filled in the cavities left by the old pickups. The result is basically an SB-900.
Pete then refinished the bass black and even managed to re-apply the Aria Pro logos and patent text on the headstock! Check out the full restoration process over at the Guitars of Matsumoku! You can also check out Pete playing the blues in that same thread.