I managed to shim the neck. After around 15 tries, unbolting adding/removing shim, rebolting, checking action.. I got it pretty good. While the action is not as low as I'd like, the break angle and overall relief is pretty close.. I am still left with the truss rod nut all the way loose though. Im relying on string tension to bring the neck relief up.
Re the electronics.. To get the thing going I just wired up the bridge pickup to the volume pot and output.. When I decide to replace the pickups, I'll attempt a batter job at wiring. Or Im even thinking of getting a set of EMGs, so install is easy.