Yeah, you might want to add some leafs(sp) to the At-At texture. You can just search them on google You might also ask me for some animations for your guns. Starwars guns eh Or for the lightsaber :O
I have an idea, instead of having just one path (the bridge) going between the two bases, why not have a submerged tunnels going under the river? The tunnel goes in, and then it is filled with water, and it continues to the other side. Maybe one tunnel for vehicles, on for foot soldiers?
Oh, it could be an under water tunnel that the forerunners built! Have windows facing out into the water, with glass over them! Then a giant crack in one of the windows from where the water flowed in.
Niow concerning the water, have a water fall at one end, and on the other a giant dam. How about a giant walk-on-able cable crossing between the two buildings.
Meh, just some suggestions, do as you like though.
Yea, some vents go to dead ends, and some just fall out to the midddle of nowhere, and you die from falling. But some, take you to the exact right place you want.
Looking good, It would be cool if you replaced the MC with bobba fett or somthing, also I have blueprints of alot of star wars stuff, so if you need any blueprints just say.
You might also ask me for some animations for your guns. Starwars guns eh 
(i have my own project team remember 
Heres one more:
