Since your place is already furnished you can test this out pretty easily by changing the minimum stay to 30 days.

So be prepared.

You would want to check local zoning to make sure you could build more than one as a lot goes into that beyond just being close to plumbing, electric, and gas.When you mention "a lot goes into that beyond just being close to plumbing, electric, and gas," what are the top things people tend to overlook when preparing to build ADUs?

I hope to never have to use either but the martial arts training certainly prepares me better to NOT use it than carrying a CCW does, if that makes any sense. 

You’ve already done the research and have the resources, so trust that you’re as prepared as you can be.

Just make sure you’re prepared to cover any shortfalls on that property and have a strong plan for deploying the new capital effectively.

Keeping it as one big space may set it apart from standard storage units, but you could also test demand with dividers for varied price points.

Percolation test.  

I have so far tested out Harvest, Toggle and Clockify they all track time but they do not allow to attach any support to the task.  

That will put you in a strong position when you start investing in real estate.Using this time to learn and prepare is a smart move.