That will be hard for me to do.....plan out case gauge dimensions. I don’t own any,never used any either. Just rely on calipers and chambers.i use mostly Lee tools. I’m sure the diameters for different brands would be similar.
Here‘s another idea. I collect odd brass and keep one example of each caliber on a shelf above my bench. I also have my dummy rounds for the calibers I load. They are just stored in empty cartridge blocks. Some fit fine while others are either too large or too small. It would be nice to have a block with caliber-sized holes to hold the cartridges.
Another idea. How about a box to hold various case length gages?