About this 3D model
This atx mount replaces my old paperboard box :D After trying to mount it, i versioned it to 0.1 because it has two little drawbacks: 1. Position of the screws: it will be screwed to the bottom of the upper extrusion, no way to use any screwdriver or similar except tongs. 2. More instable than i've thought, but stable enough to never fall off. I don't know where your AC and DC power leaves the power supply, so you might need to customize it. The OpenScad file is very customizable. Set the parameter MOUNTED=true to view the mounted version in openscad.