Don't know if you're found a movement yet, but here are some thoughts. P&S clocks almost always had wooden works movements. If you're trying to be as authentic as possible, you might try looking for one of these. David Lindow might have some ideas but he makes brass movements. Don and George Bruno (son and father) specialize in repairing wooden works movements and might be able to help or even have one for you. (ph. # for Don, 860-489-4904). You might also try local chapter of National Association of Watch and Clock collectors (www.nawcc.org
). They publish a monthly MART that sells things like this. Also sometimes can be found at a clock auction.
For reverse painting, the person to contact is Tom Moberg, (517) 723-3112.