It came with plastic metric spacers but since I didn't have metric mating hardware, I used some #4 spacers, 5/8" long. The housing length is designed around this. I also mounted the switches on the front of the board accidentally but since it looked just as good, I left them there and made buttons to accommodate them. I bought 2.5mm acrylic sheet from McMaster-Carr.
Files are in Inventor format. Let me know if you'd like step files.