[blincoln]

If I ever have a house built to my own specs, I want to get the best of both worlds by using drywall, but with most/all of the interior walls being maintenance corridors accessible via concealed doorways. A modern version of the way the dormitory in Real Genius was constructed.

Just make the house itself ~10% larger than it would be otherwise, so the usable floorspace is the same.

Adding/repairing wiring and plumbing would be easy. Every wall could have two layers of thermal/sound insulation. And who doesn't love secret passages?