I've been working on this map for a little while now, it's about halfway completed. Most of the layout is done and most of the textures are on as well. I just want some suggestions on balance/layout/whatever to improve it as much as possible. Keep in mind there are some textures lights and other things missing right now.
Here's the roof of the map, I plan to add a lot more pipes and lights.

Another view of the roof, better showing the crane, of which I'm quite pleased.


Here's a room I am quite happy with, there's a hole in the glass ceiling that leads to the roof which is reachable from here by jetpacks as well as goons and marauders.

The 'green tunnel' leading to the alien base.

And here's the layout. The ground floor is outlined in yellow, basement is orange and the roof is green.

Comments and suggestions are welcome.

Also, just a quick question. It seems the clip texture does not take on the properties given it by the common.shader file. Instead I see a black and white grid, unless I create a brush in the same position with the nobuild texture in which case it becomes transparent. Can someone shed light on this?