RV / Camper Mounting bracket for battery monitor

I designed this small battery monitoring bracket to keep track of my RV battery voltages. It contains a 12V and a 24V display which can be switched on and off seperately

Electronics are available on Banggood:
switches: https://www.banggood.com/5pcs-12V-12mm-OnOff-Latching-Push-Button-Switch-Red-Green-p-1065108.html?rmmds=myorder&cur_warehouse=CN

Voltage display: https://www.banggood.com/0_28-Inch-2_5V-30V-Mini-Digital-Voltmeter-p-974258.html?cur_warehouse=CN

A tiny bit of filing may be