After building the development rig it was time to crack open the donor clock and remove unnecessary components.  I saved the clock face, ringer assembly, and the button (which previously activated the light). The disassembly was my usual level of chaotic evidence below:

I separated the wheat from the chaff, specifically tossing: the clock hands; the clock mechanism; and the battery compartment.

The final collection of parts for reuse are shown neatly below: