i`m a fan of wrist worn mini computers like the one seen in resident evil, i also like the idea of using one like a smart watch instead of having a watch that just tells you the time or counts how many steps you have taken, since no one is selling one anymore that comes close to what i`m after (neptune pine came close but try finding a good one now), building one from scratch seams to be the only option for now, the watch i`m after should have a touch display between 2.2" and 4" of any type, be able to run as fast as possible the pi zero w might just cut it, as well as a micro/nano sim card slot it should also include 2 or 3 micro sd card slots, an easy to change battery giving you the option to either charge it in the watch or switch it out for a fully charged one that can be charged seperately from the watch, and if it could have a voice command option that would great, apart from a pi zero what other small computers could be used, i know the omega 2 onion is a possible choice but are there other small soc that could do the job.