http://www.teamfortress.com/post.php?id=4773&p=1
Valve said:A few months ago we got a chance to visit Weta Workshop and were blown away by all the amazing things that they had made. Remembering how lonely our new offices were and how we've been meaning to spruce them up, we asked them if they could make something for us. They agreed, large sums of cash and top secret blue prints of a sentry gun were exchanged, and they got to work. Throughout the entire process, Weta Workshop teased us with gorgeous high resolution pictures and videos of their progress.
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