Thingiverse is full of ATX-to-general-PSU conversions. Why I created another one? Because I did not want the outputs directly on the ATX PSU. I want them on separate box connected to PSU by cable.

No

No

The box is held together with four M4x40 screws with socket heads.

There is lot of instructions how to convert ATX PSU to general purpose one. For example this on WikiHow. So, I provide just a quick cheat sheet on wire colors:

• Black = ground
• Yellow = +12 V
• Red = +5 V
• Orange = + 3.3 V
• White = -5 V
• Blue = -12 V
• Gray or Brown = "power good" signal +5 V; connect to LED trough 330 ohm resistor and to the ground
• Green = on/off; connect to ground trough power switch.