These organizer modules fit to the top of your keyboard. The pre-made ones are for the Cherry G80-3000 series. You can customize them either by yourself (you need OpenSCAD and the BDSL2 library) or send me the following measurements:

• thickness of the keyboard at the top
• distance to the first row of keys
• how may pens you want to store, or how big the boxes for the other design should be