I agree, only if the catwalk was open to the public it would be awesome...
We spent around an hour up there watching as keepers trained Rachinpur (sp?) in and out of the barn area right below us.
I've been up there too. It is quite a view! Though, the view of the right of the enclosure is much better than this. There's a lot less metal and the exhibit is larger on the right. I guess they can't keep it open to public because that would interfere with some of the medical work.