Abstract: Card cages for mounting an array of electronic modules are provided for. The card cage comprises a plurality of generally rectangular shaped panels, including a top panel, a bottom panel, a back panel, and two side panels. The panels are adapted for assembly into a generally right-rectangular prism shaped frame having a closed back and an open front and defining one or more module mounting areas. The card cage also comprises guides adapted to slidably receive one or more electronic modules having electrical connectors. The guides are provided on at least one panel defining each mounting area. The back panel has electrical connectors adapted to engage the electrical connectors of the electronic modules. The top, bottom, and side panels are interlockable. Those interlockable panels are fabricated from a single sheet of metal and have a plurality of integral interlocking members. The interlocking members collectively constitute a plurality of associated pairs of tongues and openings.