I'll send you FReepmail about your proposed cabinet. But I was only kidding about locking up the book.
It really belongs in your bedroom.
Under the mattress?
Dad built false walls in the closets on several houses to store guns and other valuables, and once a whole gun-cabinet setup in a 1/2-height attic space. He could probably do something with my husband's closet - mine has the baby's bed (and the baby) in it, in addition to all my clothes and craft supplies, including two looms. It's very crowded in there!