Sullust is a pretty important planet for the NR, both in lore and in game, sadly it seems to be missing from the NR Era 1 colossal full galaxy map. If balancing would be broken too much by this, perhaps make Hoth and Bespin independent as a trade off.

The colossal, full galaxy map seems to omit some important (either for the time period or in general) planets in general. No Korriban, Kamino or Geonosis. I'd trade Bormus or some other Gelgelar for an "important" planet any day.

TL;DR: Please add stuff to FG colossal. Or if that's too much, please add Sullust. Or if that's too much, then don't worry, because the submod is cool anyway

How about a colossus known galaxy from the ground up with the empire starting at the Maw (or something) instead of in the core and the NR in the core.

And with the non playable factions having a decent chunk of territory

Edit: or having the empire start at Kamino and/or Rothana

Alternatively depending on what 3.5 adds to custom maps, make some colossal custom maps (one full and one known). Currently generating customs maps doesn't work, but if you are able to, then adding some would mean a great deal