The yellow boxes are nothing. They are decorative images that appear on the original Robotron CPO. I think they were meant to be images of buttons.
All the buttons are lit translucent leafs and the joysticks are red-knobbed WICO 8-ways. The center of the target is a spinner. The top 5" of the CPO is for the backsplash wihich sits at about a 60 degree angle to the rest of the CPO.