I was looking at some dinosaur skeletons and I thought the leg arrangement wasn't too different from a 'goat walker' mek. So I very quickly rigged up a raptor and it looked like this:
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The mek, by the way is at the top. I have never been happy with the animations of this one, but the legs did find their way into the Big Pig. Visit http://teamxbow.org/video/dino5 to see a video showing a few of the animations. The rigging is not perfect, the texture slapped on, and a few kinks in the animation (see tail at end) but it doesn't look to bad.