Wow, that's a really great pond!
I might borrow some design cues from this one as I'm in the midst of planning a redesign for my one pond; I don't like where mine is located at the moment, and I would love to pull off something similar to this one.
Let me know if you have any questions, I could also PM you a link to my pond build thread.
That'd be awesome as I'm trying to figure out the feasibility of pulling something similar off.