All right, folks, I got a little feedback from Twitter (and from my wife... ) and I decided to channel my best Chris Foss and Ralph McQuarrie to put some space hulks in various states of repair around the map. At this point, I'm done with the pen work, I took a solid photograph, and I completed the first pass of digital manipulation to invert the starfield and leave the map features as black-on-white. Here's the photo of my pen-and-paper line work:

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And here's the starting point for my coloring and effects work!

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I'm really happy with where this is going.