It looks great so far! You’ve done a great job breaking it down with a solid introduction explaining the who, what, and why before jumping into the step-by-step instructions! I’ve added a link to this write-up at the top of the SharpTools Custom Presence article.
One thing I’ve seen before is the commands to control SmartThings can get dropped if they are triggered while you are transitioning from cellular to wifi (or vice versa), so I’ve seen some users add retry logic like this post from @hellfire51: