Well, I have changed the textures in the Underground area to common ones.
I have changed the func_buttons to func_doors, added triggers for them and the doors open and close.
One problem with the doors though.
If I stand in the trigger area, then the doors half opens, then shuits, then half opens, then shuts, this goes on.
The only way of openin a door is to touch the door, then quickly back away so you dont activate the trigger again, causing the door to close.
Have I missed something here?