A latchable enclosure in the form of a box having a base, four sidewalls, and an open top face which may be closed by a cover plate or lid over its open top for covering components stored in the enclosure. The enclosure may be stiffened by providing a removable or permanent stiffening ring around the inside surface of the open top. This stiffening ring may also provide locations for attachment of components or mounting tracks. The enclosure may also include vertical mounting stiffeners that act to further increase the stiffness of the enclosure while also acting as mounting tracks for direct or indirect (through separate mounting brackets) attachment of components. The vertical mounting stiffeners may include a plurality of holes for said attachment.