Electronic control box for manual slider

One day, I saw the Edelkrone and that's cool! But it's too experience for me, so I decide to made one.
I bought the manual slider from China, it is cheaper, it is about $61.
The control box included 28byj-48 stepper motor, uln2003, DC/DC Step-Down Converter ,9V battery and Arduino nano.
The hole on the cover was used for 16mm switch.

https://www.youtube.com/watch?v=PraKSWgHl3s&feature=youtu.be