Rotozips can definitely stray very quickly if you're not used to them....and even on occasion if you use them all the time.
If you use a rotozip, make sure to hold it firmly and that the cutting bit is only the depth of the drywall so you don't hit any wires.
I use a rotozip sometimes, but a drywall saw more often (as opposed to a drywall/razor knife).
Also, is the tank on an interior wall? That will make fishing a circuit down the wall easier. If it's insulated it can still be accomplished but with a little more difficulty.
There are also special boxes to use that are cut-in boxes.
I'd be more than willing to help with the electrical Ron, just let me know and I can make arrangements to come out there.
Have you thought of putting the outlets into the stand? You could plug the stand in....then if you do move it, you have all the outlets you need.
Keep in mind that if you make the multiple outlets a modular system that is fed by using an extension cord to plug into an existing wall outlet you need to use a 14 gauge cord, not the cheaper 16, 18, or even smaller gauge cords.
It also limits the fed modular system to only a single circuit.