Good to think about.... I have gone back and forth on whether it is too much of a luxury to have the individual tack rooms or not. We'll have to see what the costs come out to when we are actually doing it, and what kind of clientelle we are really going toward. I do want this place to be a high-end boarding facility, but I go back and forth on whether I want to be in the middle of suburbia where I'd attract the horse show set, or whether I want to be up adjacent to the state forest (10 miles out of town) and attract trail riders. Or both ;~D
And as for fire hazard, I had already considered, that not only would I have a master key and light switch, but that there would be no electrical outlets in the tack rooms, those would be out in the aisle where I can see them.
If the cost appropriate maybe you could firewall them.
Metal conduit, all surface mounted, single conduit leads to overhead lights over each stall. Safety caps (the outdoor waterproof type) on each outlet.
Your idea of keeping all the electrical out where you can see it is a very good one. The metal conduit prevents accidents to wires.