Abstract: A very light enclosure for electronic systems incorporates a rigid core enclosure structure formed with forward and rearward rigid, zig-zag configured, generally open mesh structure stabilization frames extending between oppositely disposed connection ends. The connection ends are rigidly attached to oppositely disposed sheet metal side assemblies to complete the core enclosure structure. The structure stabilization frames directly support card guides and power supply modules on oppositely disposed sides of a backplane tray.