Hi, Ron
The IDC connectors are very easy to obtain and are now also available for purchase directly from PoLabs webstore.
The spindle encoder should use the 'Ultra-fast encoder' feature, avaialble on pins 8,12,13.
Home and limit switches can be connected to any free pin of the PoKeys device.
For the 10V output, we suggest to use one of the PWM outputs, an RC filter and an operation amplifier to amplify the voltage from 3.3V to 10V.
Matevž, PoLabs