So imagine an M-ITX motherboard and the graphics card. Above the GPU that would be horizontally mounted, there would be a vertical Flex ATX PSU. What software should I use to design this case? SolidWorks, SketchUp, etc.? Also where should I get references? I know that Protocase has a design guide.- http://www.protocase.com/pdf/How_to_design_enclosures_for_motherboard_based_systems_092010.pdf