Hey, Zoidberg is getting one whole side of the cab just to himself, so he's well taken care already. But yeah, I do want to put the professor in somewhere, but I'm struggling to find a way to put him in that doesn't look like he was tacked on as an afterthought.
Heh, maybe on the rear of the cab, so he's never really seen until one day a friend peeks behind the cab and sees him, and then I can say, "Hey, he must've got lost.".