I had some issues with the position of the buttons and joystick. I wanted them to be symetrical on both side of the panel and lower but it was not confortable. So I ended up with a non symetrical positionning.
The second issu was during the drilling of the hole. For the first drills I put nothing under the drill and when the bit came trough the panel it rip off a big thickness of wood..... I will need to clean up this mess with the router.
Next step is using the router to clean my drilling mess and to adapt joystick and trackball.