I do see the similarity. Fortunately, even without knowing of such likeness, I changed the design of the mega-freighter "hoover ship" about a year ago. Though it has the same basic frame (sweeping wing design with raised control tower from the center of the craft), it's become heavily detailed and "mega-greebled": a process in which I change components with the addition of entire large chunks. For instance, what was once a smooth top surface of an engine block may become outfitted with a three-deck superstructure. It's actually this process that resulted in the beauty of the Alexander. Trust me, when it's finished, the "hoover" ship will look very different, and very cool.
These are, after all, going to be the primary mobile battlestations of the NDC, except when a Dominant-sized ship can be used. In fact the opening screens of the game, telling the story to the player, will feature a wide-angle scene in which at least 20 of these are in formation above Earth, with an entire military fleet undergoing refit and refueling. At 12 km in wingspan, they're the biggest ships in the entire game, save for the NCS Chrenari, at 72 km long. Yes, you read both of those sizes right.
I'm still not sure on what I'll call them, though. I've been thinking of calling them the Atlas Class, because of their immense carrying capacity. Either way, they're being categorized as "Arks". While Hunter Killers hunt and kill, and Dominants command the battlefield, Arks carry supplies and troops in immeasurable quantity from world to world.