This is something I drafted up last year and nearly forgot about.
I created a very rough galaxy map (although it's really only a corner of the Milky Way, because space is huge and this was already enough) to get an idea of where everything was. I actually forgot that the Hotum ended up closer to the Yinil and Earth on this map, and might need to revisit the line in the story about their location.
This is very rough, particularly in terms of style (this is basically a first draft). I don't want to put too much time or effort into the galaxy map, as the story will be much more focused on the Rim (which will need a more zoomed in version as it gets fleshed out). Also, Dominio is likely to move around (I'm undecided on its location).
If/when I do the updated, fancier version, I'll post it here before it goes in the book.
Let me know if you have any thoughts on this, or see any problems.