To those of you who have been following along with my progress on these rigs, I'm sure you know the drill by now. Same basic rig as Fat Cat and Kat for consistency reasons, but with a few unique attributes. I'll run through the parts of Issac's rig that differentiates it from the previous two.
Because the Issac model has goggles instead of real eyes, there wasn't a need to create brow rivets or create joints for the eyelids to blink. Instead, only a look control was needed. I wanted to have an attribute in the controller which would enable the eyes to spin around, but I was unable to find a way to do so without the eye rotation on the Eye Look controller locking up in the Y rotation axis.
Volume preservation also works!
The harness seemed a little daunting to rig at first, but after remembering some techniques learned from the online tutorials, it became relatively clear and simple. There were, still, some issues with grouping this into the main rig that proved a pain to resolve, however.