The easiest way to make it tell time is to have marks on the wall where the counterweight falls for every minute, and then use it as a timer. It only runs for a few minutes (without a spring or motor modification) so anything more is a bit unnecessary I think. Feel free to do a remix though, I'd love to see it! All the gears were sized for easy of assembly and making sure it didn't bind up. Adding too much reduction between stages of the tourbillon would require too much counterweight.