Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
Here you can see how I have made and I´m making the new galactic map from my mod. I made a scene at 3dmax with each planet. The coordinates from x,y,z at 3dmax are the same from the game. Thanks to it, you can see all the planets at sametime and move them to the best positions without be loading the game each time that you need a change.
I know how probably many of you have not 3dmax 8 but you can make it at all the 3dmax versions, just you must create a sphere or even a box object for each planet and you will be able create your galactic map.