Never mentioned anything but house militaries, frankly. These are the only factions I see as being "the whole faction", so to speak. The Zoners inherently would be fractured, as would the criminal factions and virtually anyone who wasn't government or corporate.
The Bounty Hunters I can certainly see as having subguilds, and their size does mean they could have a battleship or two. No problem with that, it fits their RP.