I was looking for a small switch panel for my Jeep JK, expensive or way too big, at least what ever I could find. Here's my design, for my purpose. The phone plug is for my Ham radio microphone, just three button switches available in any automotive store and the left blank space has groove underneath for a 13mm round hole for, well, whatever. I have 3 relays under the hood for the switches, only one that I'm actually using for RVi supplemental break.

Two screws secure it in place underneath out of sight, because nothing glued stays in place in a jeep.

Added another version with safety toggle switch and full back wall

09/16/2022 Added final picture. The red safety toggle was interfering with 4wd shifter on the original design so I mirrored the print, now the Toggle switch is on the right and doesn't bother anything.