I originally designed this because having a tether on the floor playing VR was extremely distracting to me. There are other systems that use multiple leashes, but they drop the cable far enough from the ceiling that my hands would sometime catch the cable. In addition, I could never get the tension quite right. This was my solution.
See it in action here: https://youtu.be/P2-Hm8933vo
Each pulley will require the following:
2 anchor screws
4 m3x16 screws
2 m3 hex nuts
Standard 608 bearing
A piece of paracord or stretchy cord
The author hasn't provided the model origin yet.