A shelf device facilitates access to electronic modules within an enclosure having multiple vertically stacked levels of module storage locations. A pair of support arms each have an attachment structure on a distal portion of the support arm that is designed to attach to a first one of the vertically stacked levels. A guide rail extends from the distal portion of the support arm toward a proximal portion of the support arm. A cross brace structure is configured to pivotally attach to distal portions of the pair of support arms and a proximal portion of a first one of the support arms. A pair of vertical braces are each configured to pivotally attach to a respective one of the pair of support arms and having a detachable connection structure that is designed to attach to a second one of the vertically stacked levels.