Based on the great work from @ozarkexpedition: https://makerworld.com/en/@ozarkexpedition

Essentially, it's the same SCAD file, but with the addition of an option to do not round the corners on baseplates. Why? My child enjoys combining baseplates, so having round corners makes it challenging.

For more info about how to use it, check the original file: https://makerworld.com/en/models/479021