This is probably the best single player mod I've played so far. I think it will be great once the remaining factions have been added and some bugs have been worked out (like the ship animation lag and, more importantly, some of the pathing).
My only serious negative criticism is that the dialogue needs to be looked at by someone with impeccable English, because I'm finding a lot of typos, a few misspellings, and quite a few grammatical constructs that just don't work. Also, a few dialogue options lead to nonsense or missing text and should be filled in or removed.
Other than that, all I suggest is keeping the various troop trees interesting and adding more items (and replacing the old ones like Sarranid gear). If that is done, I think this might become the best single player mod until Fire and Steel comes out.