It sounds like you are happy with your new toy. Great!
Did you take the machine to the rink to do the young lady's skates on site?
What do you feel you could do for her with the powered machine that you couldn't do with the Pro-Filer?
You are missing three measurements, that would make you look like a real expert:
1. How much metal are you removing? A good place to measure with your calipers is under the stanchion.
2. Are you removing about as much on the front as on the rear?
3. As far as you can tell, does the rocker profile still match a tracing from before? Or if it looks to you like the previous butcher removed the sweet spot (or whatever you want to call the rocker transition point), did you put one back, roughly under the ball of her foot?
I admit that 99.999% of skate techs would never measure any of these things. But think how much you will impress all those fine young ladies by taking out a precision calipers.
Also, a few of the real experts keep a file on each "customer". It might contain things like name, hollow, a tracing of their blade, and whether they wanted you to dull the blade (i.e., de-burr). It would make you look even more professional.
Don't forget to give all those fine young ladies your contact info!
(Of course, their parents will start getting worried about you.)
If your rink already has a pro shop or designated skate tech, they could get very mad at you. Typically, they pay a fee to the rink for exclusive rights. And if your rink doesn't, and rink management finds out, they might want to charge you for the privilege of sharpening other people's skates - even if you don't charge.