I'd like to add another light switch in my bathroom, near the doorway. There is a narrow area between the door frame and a wall cabinet, but there are studs behind this area, so no room for an electrical box. Below the cabinet is a granite backsplash, which I don't want to cut through. I'm thinking of putting the switch into the side of the cabinet. Would this violate any codes? The box would be inside the cabinet, but I'd put wood around it so that it's not visible or touchable. Any problem doing it this way? Thanks for any help.