I think you should add a smaller sub-nexus with an interior, It could alow more RP and stuff to happen, also quick question... Does this map have node graphs?
I like doing NPC battles

Thats a great Idea, I have been thinking about that for a while now. Would you want dome sort of combine control center? Maybe with overwatch announcments or something?

Hmmm... That would be pretty cool, good Idea. Like a sub-nexus with a shooting range, SeC's office and stuff

I have an idea!

Like...it has a navigation for the AIs

There are already node graphs (NPC Nav points) in the map they just arent that well done

You should add some more combine buildings like some bunkers or some like that.

I suppose an idea for a bigger Citadel would be to rig up a 3D skybox brush directly above the building itself, in effect making it look far taller.

A core (Like episode 1)

you should add some thing like a combine outpost

I have one. REMOVE. THE. SCREAMER

Wut?

I don't know why, ironically the screamer from the original map is broken for me. It works here though its at the cafe Baltic

A power core to power the citadel

If you could add a pod system, that would be cool :)

I havent got around to incorporating any of your ideas as I have been consumed by other tasks in my life, But I appriciate the feedback and am compiling your ideas. When I do begin work on it again, I will let you all know which ideas I have decided on and ask for your feedback. Thanks Again for the input :)