Crazy idea of the day: to get around body corporate restrictions on building additions to a house, build a deck indoors, turning, say, your spare bedroom into an "outdoor" entertainment area. The only problems I've come up with so far are ventilation, lighting (to make it look like you're outdoors) and the fact that a raised wooden floor would collect a lot of dust underneath. So pretty much everything, I suppose.
Mokalus of Borg
PS - I don't even have any "artists conception" sketches to show you.
PPS - But that's about as far as the idea would likely go anyway.