Train Railway Simulator Controller

My goal was to build a controller for a train simulator (ZUSI) for as little money as possible. I paid less than 50 euros for all the components. Features:- 4x levers with potentiometer with 10 or more click stops- 9x Push buttons- 1x potentiometer for door selection- 1x Arduino Leonardo for the controller DimensionsWidth: approx. 25cmHeight: approx. 4cm (without the levers)Depth: approx. 10cm Levers:The levers each have click stops. I used 10 click-stops for both levers on the right (brake) and a little more for the levers on the left (drive) so that you can adjust the lever more precisely. 4x rotary potentiometer Item no.: RK09K111-LIN10Khttps://www.reichelt.com/ch/de/shop/produkt/drehpotentiometer_mono_10_kohm_linear_6_mm-73808?currency=CHF 16x screws + nutThread length 18mm with diameter up to 3mm Push-button:9x article no.: T 113A SWhttps://www.reichelt.de/de/de/shop/produkt/miniatur-drucktaster_0_5a-24vac_1x_ein_sw-45167?nbc=1&trstct=pol_7 Door selector:1x rotary potentiometer Ar