the best/first one I ever seen was in a buddy's house.....
it was located in the basement, but the exhaust directed outside for noise control, the simple paper bag caught the big stuff. no filters, the fine stuff was thrown outside.....
there were remote outlets placed throughout the two story house......each level had its own hose setup, secured with an outlet in small broom closets, which hung on a rod similar to a fire hose, and pulled out what you needed, all accessories were located in this space as well.....
there was a broom outlet located under one of the kitchen cabinets, you swept the dirt towards it, and a sensor on the broom opened the door and sucked in the dirt...
don't forget to add a port for the garage to vacuum out vehicles as well.....
there were two powerheads for carpets, one was vacuum driven, not bad for regular pile carpets, and an electric motorized one for thick pile plush....
I eventually want one for the new house.....they are silent, at least inside the home, where else can you vacuum without disturbing anyone...