So,
I succeeded in making my own button box. For the moment I used a see through lunch box to experiment with the button layout and later I'll make the final one with a black hard plastic lunchbox.
However, the cable to connect the Dash Pro and the Button adapter is a little bit short for my setup. I need a cable that's at least twice as long so I can mount the button adapter inside my botton box and you won't see any cables outside.
Cristiano, where can I get a longer connection cable? Is it available in specialized electronic shops or is it custom made by symprojects?
Regards,
Mohammed