I got to work cutting the lumber according to the plans, which were free online at:
https://bonnieplants.com/gardening/how-to-build-a-vertical-herb-planter/. (SEE LINK AT BOTTOM OF THIS POST)
I won't lie, this is not a cheap build, even with buying pressure treated instead of cedar. But...it's not much more than making decent raised beds to handle the same amount of plants.