The last detail (?)

 The last detail is the hookup  of the limit switch to the system.

There are a number of reputable sources with apparent conflicting or inconsistent information. One resistor, two resistors, no resistors. 

I finally decided that a direct connection of the switch between 3.3VDC and ground with use of internal pull-up/-down resistors was what I would use.

Tomorrow, I'll do a trial run of the system.