Given that PPrune and several hundred thousand (or even millions) of other websites have been knocked out recently by a DDoS attack relying on botnets, I really, really don't want to see an unsupported, unpatched OS on a PC connected to the internet being operated by someone who clearly hasn't a clue (I don't mean you, BOAC).
You can't do much about the latter problem, but you can mitigate the former.
Something mainstream, current and more idiot-proof than a PC is indicated.
If not Linux on the PC, what about an iPad with a wifi printer, or an Apple computer?
My mother, in her seventies and a total technophobe, has recently been given an iPad and has taken to it like a duck to water for email and internet - and basic word processing capability (still better than a typewriter) can easily be added.
SD