I think the idea is large and complex. There's plenty of episodes where they use replicators to make guns with complex digital optics on them, mini transporters, tricorders, medicines, phasers, farming equipment e.t.c.

I just went and cheated and checked the wiki and yeah they start out with no replicators to make ships or shuttles, but then in DS9 they introduce industrial replicators that print large parts. But still just parts. So I guess with Voyager it's like, as long as it doesn't get absolutely obliterated you can probably print parts and repair it.