It's basically just a base (206.5mm wide so you might need to turn off the brim) with a hole for a NeoPixel LED strip, a smaller slit inside that one for a piece of 1.8mm perspex with something mounted on it, and a compartment in the back for a battery, a charger/booster, an on/off switch, and something to drive the LEDs. Here I just used one of those cheap units (about $2) that come with a small RF remote control. I included Dali's signature here, but you can just mount whatever you want. I got a bit messy with the glue, but you get the idea!