Sounds like the colony has had its Heavy Industry disrupted, bombed or sabotaged (or some other aspect of core gameplay)
Edit: Actually, how DO you get the N-0 to show up? If im understanding this file correctly, it already should. Is it just hideously rare? I actually have a Morpheus but I've never seen a zero.
It's just rare. Eventually it does show up in military markets (or even more rarely, as a derelict ship procedurally generated somewhere).
Right now, the rarest ships have no interesting ways to fall into player hands - because if I made them more common, they would also be more common in faction fleets, which is undesireable. But they do spawn - just rarely. Maybe in the future there will be quests or some other ways to get them.