Not to hijack the thread, i have plans to do it in my basement/mancave. I have a side room that will nicelly be hidden behind a secret bookcase.
A guy over at KLOV built a really cool secret door to his arcade room with a haunted bookcase..Its a long thread, but some cool pictures during the process and videos of it working...
http://forums.arcade-museum.com/showthread.php?t=177572