Are you building this to sell?
The relative cost of running phone lines to a room is nothing. Make it CAT 5 or 6 and the telco can use it if need be. You would also be using CAT 5 cable for the controls to the devices you want to maintain.
I think the industrial (I'm guessing you mean commercial) toilet idea is awful, but there are very high tech toilets available that fit in the home.
Inline water heaters are the most efficient and gas is even more cost effective than electric.
Commercial Washers and dryers are just bigger and probably overkill for a residence.
HEPA filters are available for dust free environments.
Speakers throughout are now common in higher end homes. Wire the TV area for home theater. Mount the speakers low in the bathroom so they wont be affected as much by the steam.
The place where you can go commercial and not worry is in the kitchen with a 6 burner gas range and monster refer.
Quick and dirty and worth every penny you paid for the advice