Sometimes as much as something may seem to fit in for the narrative of an environment, it may not be so good for the actual gameplay. Ghosthunt 3 had this huge section before this evening - a big flooded pump room. It looked rad, but walking around that shit was a pain in the ass. So I deleted the living crap right out of that section and rebuilt it completely. Now I've got this shipping area with trucks and containers. I think it's so badass that If I owned a Occulas Rift, I'd sit my ass down in it and eat my fucking sandwiches.
In all seriousness though I do this a lot. I spent the last few weeks modifying the layout of GH3 and it's so much smoother now. I've rebuilt several areas to make them more player friendly.
Here's a great big image of Ghosthunt 3, top-down in Hammer.
It's probably not going to get any bigger. If you're worried about it not being big enough - don't. The only reason GH2 looked bigger in hammer (Assuming you saw those pics) is because it had lots of long corridors. This map is much more condensed and there are cubbyholes aplenty.