Apparently this rig was built specifically to show off the capabilities of the digger. Well, I can't see what else it would be used for! Pretty good demo though.
There's a youtube vid of this being done in THE DARK in Contract Journal 24th Feb issue. Look in the 'what's hot' section for Digger blog: Liebherr R312 climbing stunt part 2. Sorry but I don't know how to put a link to it here.