I have a company that builds them for me. They are made to fit micro-atx boards. The mounting hardware inside the case is design to hold a 3.5 hdd with Hard drive shock-reducing suspension , opus 150 or the new 180psu. Custom slim clear-anodized aluminum Micro-ATX enclosure, designed for maximum cooling and air-flow.
Dimensions: 12.0x11.2" footprint, 11.2x11.2x3.7" box. I sell these case for $149.99