Kawai Tsugite customizable puzzle

Kawai Tsugite is a Japanese joint that can be assembled three different ways - one in a straight line, two at right angles.
The way to build a wooden one is pretty well described in this page: https://www.ethan-brammeier.com/kawai-tsugite-joint

My idea was to recreate under OpenScad what a good Japanese woodworker would do:
- cut a pyramid corner
- remove 3 prismatic bits
- give some play for a smooth assembly.

If you open the scad file, you'll see how easy this translates into OpensSc