Seems to me you need the cable with the proper connector to start with. No connector type or pin outs are listed, nor are component types, although a diode is a diode, SPDT switch is easy enough, and the pull up resistor values are at least given (but not the other three resistors). One would assume this would be built inside a small project box also.
I'm not volunteering, hence my not contacting you via PM. :P