Thank you both!

Personally, I like having the central core of the galaxy at higher opacity - and that also goes with the story content a little better.

I noticed that my alphabetizing in the key was out of order, so I fixed that (except for the Underworlds), and I'm trying out some more pronounced light beams coming from the top two foreground structures. But other than that, I think I might be...done?

What do you think, are these beams from the sphere and the rings cool or are they just too much?

Click image for larger version. 

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The Axiom Republic is the largest galactic polity on the Galactic Standard Map, though most of the Cathedral is highly irradiated and uninhabitable. It is a baroque state of learning and cultural achievement where even the soldiers are poets and statespeople. The Republic is a sedate nation, though its relations are strained with the Imperium. The short story "Conference" takes place here, at some of the worlds now named on this map.