This is casing designed for a "DIY keyboard" USB controller pcb and a 3x4 key mechanical keyboard.
The controller can be bought at pcsensor.com. It's called "DIY-keyboard"
The driver software lets you assign anything to one of the connected keys like a keystroke, a string or a mouse action. Perfect for a small macro keyboard, MMO gaming etc..
The keyboard comes in various sizes from 5 to 25 keys. Search ebay for "Keyboard Keys Metal Panel SPST Machine Pushbutton Switch".
The transparant caps can be removed to be able to legend the key
The pcb can be screwed down with 4 small M3 screws. The keyboardpanel does not need to be screwed down as it will be hold tightly when the casing is closed.
5 M3 screws of approx. 5-8mm are needed to close the casing.
Note that the back screw 'pilar' was altered a little bit after i printed the case. These changes are also made in the files you can download.