That's what I thought when I saw the guest bed in the bathroom.
(Incidentally, I have a friend who calls a jar in a spare room his "downstairs bathroom". I guess you can "install" a "downstairs bathroom" when you have a guest over...)
Very cool indeed. Too bad you will need a lot of money to create a home like that -- i imagine it'd cost at least 10 grand to renovate a home like that, and countless hours of hardware hacking :)
If you ever are in a place where $/sq ft is a metric you look at when shopping for real estate, those expensive remodels become smart economic tradeoffs. For instance, if you're looking at a range of $300/sq ft, then getting rid of an entertainment center gives you 6 extra sq ft and you have $1800 to put towards a flat screen TV.
Not sure where you live, but in Australia, to do that properly (custom-build most things, the tracks, installation, etc) you'd be looking at $50k+. I recently got quoted close to $10k just for a kitchen benchtop and this guys place has all sorts of custom services and installations.
Of course, you'd have to put stuff back in its proper place every time otherwise the system would quickly break down.