Juneau is a large shipyard in Alaska and would look good as that shipyard in the north-west
Ibiza is a small resupply base in Omicron Alpha. And is NOT suitable as a replacement for a SY. We'd want it as a research station next to...
And here's a surprise a bit. Would putting a big, black hole, 60k above the map's center be a big problem?
Plus, geting the surrounding darker every meter wawy from centre - exactly like in Omicron lost, where ships after passing a few Ks turn black (black holes suck in even light)
Please remember, the point of the system is not to pile on as many 'cool' things as you can. If you put too much in it, it will end up looking bad. Black Hole does not fit in many systems, and keep in mind he can't simply take the one Nightfall made and put it in. Nightfall made that one out of multiple objects, the real black hole doesn't look spectacular.. For example, a BH would ruin Vespucci's look. Its not always good. And Taus are in the barrier like Vesp is, and will probably not look good with a BH.