Enclosure for O2 Headphone Amplifier Back Panel for Desktop Mode

I just made a back panel for my o2 amp to be able to put all the RCA plugs on the back. The corners didn't end up aligning correctly with the extruded aluminum (need more fillet) so i uploaded the design if anyone want to correct it fell free to do so.

I didn't made the front panel since i did have the front panel in aluminum.

Cheers!