I should think the Borh have to be a deliberate homage to the Cybemen - the using others to swell their ranks thing, the half-machine thing, the cylindrical creation/conversion pod thing, there was a Voyager episode with a scuttling round the floor gadget very like the nasty helper in an old Cyberman episode, using the other half of cyborg for their name... al they needed was a vulnerability to gold and it would be an open-and-shut case.