This is probably a Tetrix system robot - the base looks metal. I've also heard that the Tetrix motors are super powerful, and the NXT can be used to control them.
Now there's a strange coincidence... I missed this post when it first came out, but yesterday I happened to be in the very room where it was built and quickly worked out what it was. The structure is indeed made from tetrix, and it made use of some cool tetrix omniwheels.
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