Each disk has two holes already as long as you click the write protect correctly. If you look at the bottom of the disk there are two holes that don’t go completely through the plastic. Using these as a guide drill them out for four disks. These make up your sides. For the bottom use another disk as a template. The two holes that come naturally on every disk can serve as a guide to drill identically spaced holes at the bottom of a disk. This should line up perfectly your four sides and then it’s just a matter of cable tying it together leaving the knot of the cable tie on the inside of the box.