She has a pretty large flight deck. That might well have been the starting point for the design. But why would a "cutter" need such a large flight deck?
That particular picture was taken before the hangar module was installed. The actual flight deck length is indicated by the distance with white handrails, the length beyond that is not part of the flight deck.
So its flight deck isn't quite that large, although it's big enough to comfortably operate a Z-8.