Hey everyone!
It’s been a long time since I’ve updated this thread. In-between other projects, this whole Gremlins thing has (unfortunately) been put on the backburner. Over the last few days I had the chance to work on the Gremlin a bit more. I’ve actually completed his rig and I’ve uploaded a quick rig test video to YouTube:
I rigged him in 3ds MAX using a spline-controller based UI to drive his facial morph targets (which were all generated in Zbrush). Here’s a look at the different morph targets/blend shapes:
Here’s a look at the whole rig in 3ds MAX:


I used a CAT rig for all of the bone animated parts. The CAT system in MAX 2014 is really awesome! 
More updates coming soon!