Level Collision

I need to be able to define a somewhat complicated level collision object, for which I already have a mesh created.
I saw a class here that would be useful in this application, but I can't find it in the MogreNewt library.

My questions are these:
How does everybody else out there define level boundaries inside buildings?
Is there any way to use my mesh to create the collision object?
Has anybody used the UserMesh collision feature in either Ogre or Mogre?

Thank you for your time.

I think I may have figured out my own problem... TreeCollisions!

They were the only collision types I hadn't looked into (the name threw me off).

Sorry for creating a new thread without use.

No thread is without use. Im sure someone with the same problem saw your thread and fixed their problem as well thanks to you