When I started this project, I did not know how to surface mount solder. This greatly limited the form factor of the watch itself. The only way I could think of mounting a 40 pin MC was to do something like this:
Now however that I know how to surface mount solder, and parallax makes the propeller as a QFP (
http://www.parallax.com/product/p8x32a-q44), this is no longer a limitation. The current plans are as follows:
I do like the look of the leather band, so I decieded to keep it. The watch may be a little thicker than I'd like, but I think I will be able to fit everything inside the case once its completed. I also hope to get a circuit pattern etched into the band with a leather burning tool once the project is complete.