By the way, if you got the LEGO advent calendar this year, and want the plans for the Battlewalker, here they are:

http://rapidshare.com/files/331452610/adventwalkerprime.lxf

They aren’t precisely accurate — there’s some coloring changes I had to make, and the part of the engine where the antennae are is taller in the plans than in real life, because the Designer software refuses to deal with pieces that aren’t perfectly and gaplessly aligned. But you’ll be able to figure it out I expect.