Here’s the start of a design for the acrylic:
Basically, it’s the button dividers with a path for the ultrasonic sensor. The space on the left of the slots that are on the side of the big piece is for little LED strip segments. Mine have 3 lights per segment. There’s a “button” and space for the sensor on the bottom. Also, I’ll add some tabs to the outside of the main piece so that sides can be attached. The sides will go below this main piece to create the space below for the arduino. I created “dogbones” for all of the slots, but don’t really know how to do it right or how “right” it has to be.
Lot’s left to do, but I’ve got to try and get some rest. I’ll keep posting as I go.