To create the light pipes to bring the LEDs' light to the front, use a piece of transparent filament. Melt one of the extremities to create a transparent dome (I used a hot air soldering station, but a lighter works too) and fit the filament in the hole, cut it to size, and glue it in place with a drop of super glue (or melt the other side with a soldering iron).

The box is held closed by four 2.5 mm x 12 mm screws.

The filament I used for the top part is eSun ePLA-Matte Light Khaki that almost matches the famous Apple beige (#C2BDB0).

The bottom part is PolyMaker PolyLite PLA Dark Gray Green

The buttons are printed using some random light brown filament I had lying around.