Making an animatable caterpillarassembly / HD

Hi there
this is a four part video tutorial series dealing with how to build and animate a caterpillar rig (assembly) that is capable of following any abrupt changes of the surface/terrain/landscape underneath

here are the links to these tutorials (updated so far) >
-Part One : explaining the concept behind the caterpillar’s chain
http://www.youtube.com/watch?v=yQE4IIpZWFQ&list=UUKDe8_5_-j7HvyS6p0QLlaA&index=1&feature=plcp

-Part Two : explaining the concept behind the caterpillar’s animated rig
http://www.youtube.com/watch?v=qBPUH2f6oMk&list=UUKDe8_5_-j7HvyS6p0QLlaA&index=1&feature=plcp

hope you’ll enjoy it!
Peter