Hi Graham,
It is good to see someone else that is interested in preserving the Electric Sinks, as I am.
I would love to see more photos looking into the dishwasher of the GE Electric Sink especially. Slide the control knob off of the front of the dishwasher, then the front panel should come off by grasping the bottom of the panel and pulling straight out. Tabs at the top of the panel slide into slots in the frame when replacing the panel. If the panel is snug or stubborn in coming off, you may need to tap the bottom of the panel from inside. Please show photos of the motor/timer mechanism underneath the dishwasher. I know these machines inside and out, so don't be shy about asking questions about repairs, operation, etc. Look for the presence of a detergent cup on the front tub, upper right center. Look for complete racks including the center glass tray - part of the upper rack. Look for an impeller in good condition (new impellers are practically non-existent). Look for a drain plug to the right of the impeller. Test the water flow through the water valve - they often times plugged up over year of use. The black tub gasket around the top of the tank is the biggest cause of water leakage along the outside of the dishwasher tank denoted by white calcium deposit trails.
There is a serial number plate on the GE Electric Sink frame below the sink bowl. The first two digits of the Serial Number indicate the build year. If the serial number begins 48 or 49, then there won't be a Calrod. If the year is 50, 51, or 52, then there should be a Calrod.
Even though I have 2 Hotpoint Electric Sinks, and 4 undercounter Hotpoint Dishwashers, I don't have sufficient knowledge to speak about them. (New impellers are practically non-existent).
Mike