I've got a few crits:
These window cover things are way too orange, and a few of them are out of place:
Out of place ramp on one of the village buildings:
I don't know if this is just some assets for convenience's sake or what, but if not they should be spread out, more stuff around there, etc.
Stuff I really liked:
The whole thing is very true to the overviews of the real thing, props on that
The two village things in the NW quadrant are pretty cool, I was able to get to the far NW caves quite easily on foot.
Excellent attention to detail in the CF main base. I really like all the little briefing room setups and such, adds some good atmosphere
Just in general, some things that need fixing:
You need roads/paths of some kind in the main village. Right now it looks like no one lives there, its just a bunch of empty buildings and stuff sitting there, no sign of human habitation. Having painted paths between houses would be a good start, just something to break up the ground texture a bit from straight rocks
I assume the two random islands are just to put houses and such together? If not, they need to go
I'm sure you know this too, but you need a new texture cover for the caves, they really don't blend right now
Finally, what's with the burning ship? I just found it weird, unless you can make some sort of sensible reason for it I think it should go
All in I think it's going extremely well, keep it up!