I needed a 2-button remote pendent for a project.  It uses micro switch with buttons that extend outside the small box to actuate the switches.  Printed in PETG with different color buttons (one run the other stop).  I have extruded pockets in the back for small magnetics.  the top pits snugly onto the box but you can glue it you don't want access after assembly.  Two tops are shown but the one with the larger notch is to be used.  It allows room for the switch buttons.  There are small holes in the back for the screws that hold the switches, I used 2MM self-taping screws