Score 1 for GURPS Space. That book has had me dreaming of creating galaxies for over a decade. The only thing is due to my time constraints I always stuck with fantasy because it was much smaller scale. If you think as a GM you spend a lot of time doing things your players never find out about then try creating galaxies with planets they will probably never visit, although they could, LOL.
Awesome stuff here, one day I may try to get this between my teeth but for now I'll stick to the smaller stuff :)