Michel,
Forgive the piddly rendering/action of Shaggy but I felt like celebrating so threw this together.
I've hoped to set aside time to rig characters and try out Mark's 2008 rig but haven't settled in yet and got it done. I've come close a couple times though and hope to do some rigging in the coming weeks!
Your rigging of Shaggy really takes him to the next level.
Exercise 13 of TaoA:M... is going to be so much more fun!