You could make this using either a laser cutter or a 3D router. I used some scrap MDF and a Denford 2600 3D router to make this version. There are some construction lines on the top plate DXF which can be ignored (or used?). For the the case part, you will need to set cut depth / layer up layers of laser cut stuff accordingly (to fit the thickness of the top plate material). The points are for drilling holes, I used PC stand-offs and screws to attach the button PCB to the case.