A lot of pre-build testing involves two dangling wires and an eletret element hanging in air with no problems though it's easy to take some precautions for the long haul. I'd wrap the mic hi wire inside an earth/ground wire, in twisted-pair style for much over 2-3 inches. For the volume knob, it does no harm to do the same for the audio going and coming though some may see it as overkill. It does no harm to go the extra few seconds with it.
