SFM - Need a Skyrim dragon "Rig"

Can someone help me?
i tryed to make by myself the rig but it does not work and i cant understand where i go wrong on it…
The model is the basic dragon from the Skyrim megapack for SFM

if someone know how to create a rig on Source Filmmaker, please help me!!

(i have already watched a lot of tutorial but no one can help me because i need to create a “non human” rig)