Got the brakes installed today and everything went together pretty smoothly.
Stuff I learned along the way:
1. To keep the holes in the disc brake plates properly aligned, I clamped both plates together to use the original plates as a guide when drilling new holes. This worked well, though I'd recommend that the plates be clamped as securely as possible to your drill press. I thought I had clamped them super-securely, but they still moved a little when drilling - that metal is very thick!!
2. It's expensive to get bearings removed and installed - having a hydraulic press would have sped things up a lot, and let this happen for less money.
3. The original drum brake axles look a lot like disc brake axles... they MIGHT be identical, so this swap could be done with even less parts.
Brake: installed:
Clearance looks totally adequate:
Original brake lines can be re-shaped to line up with the new calipers:
Comparison, disc vs. drum axles:
I needed to get some paying work done, so the master cylinder will need to wait until tomorrow. ...then shortening the parking brake rods will be the last thing I need to finish. (they need to be shortened about 1-1/2 or 2")