Hola,
@Devilindy, @Gouwa asked me to clean up this prototype cnc casing for the Tone 1. I spent quite a bit of time cleaning-off all the strange vertices, I like simple 3d models. You guys could use it as a base-design for greater things. 
Notes:
- Primarily a design for cnc machining / injection moulding
- Top cover is aluminium
- Bottom cover is polycarbonate
- There’s a rubber pad below as well
- Compatible with the Generic Edition Tone Board 1
- Internal geometry un-optimised for mass-production!! (please note)
One more thing…do note that the internal geometry is not optimised for mass production…you will have to work with your supplier to fix the internal structure for their processes.
Edit:
Original design file here.