Tim Duffy at Simply Home Entertainment did an install in Beverly Hills that we featured on ModernHomeTheater.com that has HDTV garden areas with 50 inch HDTVs outside. It is an incredible home that you need to see.
Check it out here:
The problem is cost. The housing is more expensive than the HDTV itself.
How about the idea of putting the hookups out there and just bringing a small LCD out for those big BBqs in the summer? That saves a TON of $$$.