I'd like to build a wooden clockwork device thats only purpose is to rock a couple self-winding watches to keep them ticking (oh, and looking cool while doing it won't hurt). IOW, it doesn't have to tell the time itself. All it needs to do is impart some motion to a tray that holds the watches. Ideally I'd like it to run for at least 7 days before I have to wind it up again. I'd actually like to do it with a descending weight, if possible. I've never built a clock before, but I think I have the tools and some minimal skill. What I'm looking for is a pointer to a URL or 3 or other advice on where to find suitable plans. Also, this thing doesn't necessarily have to be compact. I don't want it to fill a room, but something the size of a GF clock is ok. Any ideas? Thanks.