DC Switch Box

I needed a box to hold the power plug and a switch for several projects I am making and couldn't find anything for my specific parts.  

There are 3mm holes on either side for mounting (see pictures) in a 30x8 (center to center) pattern.  There is a small slot on the bottom for wire egress to whatever you are powering.  The lid is meant to be held on my 4x m3 bolts.

How do I know if my stuff will fit?

Switch is a ~13x20mm rocker switch (may measure as 11x17 depending on whether you measure the retention tabs and little fins on the side of the switch body).  

Two styles of power plug - both fit in a 7mm hole - one is for a wire pigtail style with a hexagonal body approximately 10.3mm on the flats and the other has two screw terminals.  The barrel on the AC adapter is approximately 5.6mm.