Yes, we've seen steampunk mice before, but none that come with a pre-installed brain! Builder Peter Balch notes that "Every self-respecting Victorian Scientist needs a brain in a jar." I couldn't have said it better myself. You can see in-process photos at the link as well as an explanation of how he built it.
http://www.peterbalch.btinternet.co.uk/MousePunk.htm via Technabob