Convolution - Wood Mechanisms

This is a wood working project that demonstrates a variety of mechanisms and linkages. The project consists of all removable modules and has no metal whatsoever in the construction. The "Front" consists of four mechanisms tied together with a wood link chain. The rack and pinion in the lower left corner receives the power from a wood crankshaft through a set of gears with a 2:1 reduction. The ellipitcal gears on the back side receive power from a wood driveshaft attached to one of the four mechanisms on the front. The clapping hands on the backside receive power off the main crankshaft through a standard 1:1 standard set of gears. Because one of the mechanisms in the front cannot tolerate reverse operation, a ratchet gear with pawl is used to prevent reverse rotation and also add a unusual sound effect. A video can be seen here:
http://www.youtube.com/watch?v=fgbUV7xv_sk