Sizes in 0,1 inch - number of pins WIDE.
Scale your model height to your board length.
Example board with :
7u: Arduino pro micro, Arduino Leonardo, Arduino Nano, Teensy 4.0
11u: ESP32 DOIT DEVKIT,
Additional caps for securing, adhesive tape also works.
More sizes coming after I find boards using other widths.
The author marked this model as their own original creation.