Cherry Pi III USB and XBox power box

This is a small box that allows me to connect an unmodified power plug from an XBox 203W PSU to my Cherry Pi delta printer (http://www.thingiverse.com/thing:543303). It also provides a way to turn the PSU on and off, either with the switch or by using the PS-ON connection on the RAMPS board, and to connect a USB lead.
Although designed to fit a Cherry Pi, it should also work for any similar printer that uses 2 rails made from 20x20 aluminium extrusion and M5 t-nuts.

UPDATE: (26/04/15)