I built one of these for our Defender machine at work. I added a fake lock by cutting the chrome head of a real lock. I printed the blank buttons from the original design in orange PETg and then added the 10p text using paper printed with a template. I designed a plate for the back of the blank button to hold the paper in place. See my files added in the comments section because I could not add them directly to this Make.
Just need to add LEDs to backlight the orange buttons.
Printed the main part in Inova1800 Black
Printed the blank buttons in PETg Orange transparent face down to get the face smooth. Polished with fine grit paper after.
Spray main body with primer and sand - repeat a few time to get it smooth. Spray with Matt black paint.
I drilled away the fake "lock" and replaced it with the head of a real lock.