That is very cool, right up my alley really ( but out of my price range )because I love small things and especially making very small things.
Over the past couple years I've become obsessed with making the smallest functional brass spinning top that I can possibly make, and so far this one is the smallest.
I make them by using a dremel to spin the brass against a file and sandpaper, really I'm just limited by the little keyless Chuck I have for my dremel because it can not grip anything smaller.
EDIT : that was the wrong picture, this is the smallest one.
I couldn't really find anything online, but I think it might possibly be a record.
I don't think I can really submit it or anything though and I wouldn't exactly want a camera crew at my house...etc.