We would like some ideas on how to build a bookcase on a hinge to make a sort of hidden room. We would like to have several feet of bookcase length with one end on some sort of hinge to swing in to a 'secret' room. We would appreciate any information anyone might have as to how to go about this. We saw this type of door in a new homes tour several years ago, so we know it can be done. Thanks for any help anyone has to offer