You can download and try out the rig here:
[7/14 Note:  This downloadable rig has been discontinued and replaced with the improved practice rig.  New turning rig coming soon!]
This rig was created with help and inspiration from
Daniel Gies’ amazing work and tutorials
Duik tools v13.0.2

PuppetTools v2.3
Thanks for additional coding help from
Joe Russ at Mografi
Dan Ebberts at the Creative Cow Forums