Wrong Alternator?

Machmeter1 said
Battery (11.72V at the moment) connected and the ignition key for on - reading around 11.60 at the Alternator field connector and around 11.55 at the VR input (the VR felt somehow warm) - differences in readings may also be user error or to be blamed on my cheap multimeter.

So that seems to indicate the power is available to flow through the rotor.

Machmeter1 said
Alternator field does not have ground to the Alternator case

The top one is grounded. Screw holds it directly to the case.

Machmeter1 said
V. Started the car and went up to approx. 2000 RPM, Battery reading is 11.72V, Alternator output reads around 11.66 or so.

VI. Checked the Alternator gauge in the car - needle even with higher RPM slightly on the discharge side

I agree, as best we can then its the alternator.

As you can see, with the roundback alternators, replacing the diodes, capacitor or stator requires soldering. Replacing the rotor requires a pulley puller - that's easy - and a press - easy only if you have one.