I made something similar back in the 90s, using a small plastic carrying case that was lying around my workshop (likely came with some small power tool). Flexible plastic was easy to cut with a boxknife for thumbwheel install, it was deep/stable enough to stand up so scores could be seen, had a carrying handle, and was also handy to transport misc. items in (chalk, gloves, tip shaper, etc.). Essential if you visited newer rooms with non-Brunswick tables & played 14.1. It disappeared over the years (likely left behind somewhere when I had to give up playing due to severe tennis elbow). Might make another someday if a similar case ever turns up.