I rather like mapping things. 2 years ago I tried mapping the
40k galaxy with the understanding that Imperium sectors were square and didn't really touch each other. And I was also trying to include the major Ork Empires and Necron Dynasts, and War Rifts. And I'd also use symbols to indicate planet types, and colors to indicate which race owned the planet or system. I missed some things and made some mistakes, but had lots of fun doing it.

And so this was my first attempt:
https://www.deviantart.com/kyrtuck/art/Warhammer-40-000-galaxy-map-943122065
Then earlier this year I tried fixing and adding a lot of things to the map. And I tried doing a closeup of Calixis sector, Screaming Vortex and Koronous Expanse, yet I still didn't get all the planets for Calixis sector, damn that place!
https://www.deviantart.com/kyrtuck/art/Warhammer-40-000-Map-2-1082557287
If I do a third edition of the map (and thats a big if) maybe I just won't do the Segmentum lines and instead have the sector squares be in different colors for each segmentum. And I won't bother with any closeups, I'll just accept that I won't be able to show every single planet for some sectors.