Just waiting for the Black Hawks to ship and arrive.
Stage 1 of this build is complete, so I might post a couple of photos that will be a nice contrast with those I get from Stage 2.
Here you see the routing that was done. A bit around the tremolo recess and block/arm cavity, and the neck single coil cavity enlarged to fit the Black Hawk neck. I think that in Stage 2 more routing will be required in the control cavity to ensure that the CRL switch, Jensen cap, and mini toggle all fit properly.

The rebuild is extensive, with very few of the original parts remaining except for the neck, frets, and body.
Stage 1:
DiMarzio Clip Lock strap system
Gotoh GE1996T tremolo unit (33mm Gotoh brass block)
Gotoh FGR-2 locking nut
Gotoh SG381-20 MGT Magnum locking tuners
D'Addario EXL117 11-56 strings (C standard tuning)
D'Addario ClipLock strap system
neck pickup rout enlarged for a humbucker
Stage 2:
Bare Knuckle Black Hawk pickups (alnico 5 magnet option in the bridge, black open coils)
CRL 3-way selector switch
Bare Knuckle/Jensen capacitor: 0.022μfd
Bare Knuckle/CTS 550K volume and tone potentiometers
New pickguard for HH configuration
Custom wiring, including an on-on mini toggle for series/parallel switching on the neck pickup
Gotoh VK-1CK-18 dome knobs for volume and tone pots
Switchcraft output jack
Gotoh oval output jack plate
All new pickguard, pickup, and output jack plate screws