I was wondering if we might need a different name to "Guardian?" I've got nothing against it (personally I see it being most appropriate) but something at the back of my mind is nagging at me that its called the same thing as it is MoO. I'm all for keeping the name guardian, but if we need a placeholder, how about Sentinel, Arbitrator, Warden, Keeper or Custodian.
Actually, come to think of it, if we have a different one for each precursor race, then we we could refer to them all as Guardian, and give them appropriate names depending on who built it.
And Pd, its lookin' brilliant, keep it up!