There was already a grainy long-distance picture of the Leviathan shipsize a few months ago, but unless that suffered from size creep while not being mentioned it shouldn't be much larger than this station, at least with the other modules attached.
Definitely in favor of size creep, mobile attack stations ftw. XD If you know Space Empires, at least part IV had mobile attack stations as the final ship size. And boy, those were fun. Imperium Galactica 2 also had them, but I think battleships were a bit stronger there (either that or I was mislead by the battleships being stacked on the battle screen, which they did there).