This has not been updated for Rebellion you are correct. To be honest I'd have to dig back into it again to see what it was what I did. I think it might have been taking one of the dark star .dds files and renaming it for the spiral .dds files. As for the random texture issues that is because the texture sheet in this mod does not include any of the new textures from Rebellion or its expansions. What I did was take the texture sheet for use of all planetary zoom levels (the icons that show up on the map) and find the one for the zoomed out planets (the one that looks like a little colored pearl near the bottom of the texture sheet) and shrunk that portion of the image by 50%-75%.
If you use the incorrect texture sheet (pre-rebellion in place of the rebellion one), then the coordinates on the texture is is looking for will be pulling not just incorrect planets, but the wrong part of the texture. So a good example is normally Rebellion for a zoomed out planet would pull an image from x: 25, y:30 with 5 units for the bounds, well, if you use the wrong texture sheet, what is in those coordinates likely will be something entirely different as the source textures are from an older version of the game. Hopefully that makes some sense.
These two changes together ensured that when zoomed out, your planet bubbles (pearls, whatever they are called) wouldn't occlude the rest of the map while at the same time, removing the spiral galaxy animation which on large multiple star maps makes it hard to see what is going on when zoomed out.
Hopefully this all makes sense. I might have some time to whip something up for rebellion so that it is supported but I have been very busy and in ill health.
Thanks for looking into this Marisareneth, I hope I've explained some aspects of what I've tried to do (portions texture sheets can be resized with GIMP if needed, I think that's what I used), and hopefully I can get to them here before to long and officially update the files.
GoaFan77, does what I said make sense?