You’ve done such a great job making your own electronic control panel that the last thing you need are those wires to get pulled out and frizzy. These fancy Panel-Mount Banana Jacks look good and work well. They will snugly hold onto any 4mm banana jack or cable, and have a colorful ring you can use to help identify and categorize connections.
Each plug has an M8 screw body with a Washer+Nut combination that can be used to secure it to a panel. The back has a large slug with a hole you can solder to.
1 x 4mm Banana Female Socket BTI15 Connector Blue