I can't help but think Patton Oswalt had Babyface AKA Spider Baby
in mind when he was picturing what a Robot Chewbacca would look like.
banthafodder, I do indeed plan to use a Mater windshield for this next version of Robot Chewbacca. It gets less horrific the more I look at it. I think the minifig version is creepier, because it's a stoic Chewie, almost like a soul-less zombie. Using the Mater windshield eye-piece makes it more cartoony, with a lively character in it, and less creepazoidal.