stirling motor driver/holder

I have one of this wonderful ringbom stirling motor models. They are fascinating, with the temperature of the hand palm they run already. But you nee to take them in the hand or put them on ice to make them go.
I have nine on the desk just because it's great to see. But some time I'd like to make them run while I do something on the computer. This brought me to the idea to take a peltier element which can be heated electrically.
So I made this striling stand which has an integrated peltier e