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Travis Goodspeed's Goodwatch might be interesting. It's a complete watch pcb replacement for casios, but the info there might give some ideas.
AkosLukacs
How much space is there for other devices in the watch?
I just got the crazy idea that I could stuff a 433mhz transmitter in there (smallest looks like 0.4" x 0.2"), and then I'd be wearing a watch that would know when I got home and send out the signal to turn the lights on and heat up the dab rig.