Power supply holder for Prusa I3 with 6mm aluminium frame

I have mounted my second Prusa I3... this one is for my use... the
last one was mounted to be used in my job as secondary school teacher. In this case I have no used a complete kit sold by BQ and I have bought pieces from different sources. For the power supply of my prusa I have used a 250w slim profile model from an old desktop PC. And... to attach the power supply to the 6mm aluminum frame I have designed the piece that you can see on this page. It incorporates a hole for a switch that conn