Duplo Compatible Bracket

I was fascinated by Tiago Catarino's video on Lego Brackets and its importance to Lego building patterns, but found no brackets in Duplo form! This is my first attempt at creating a series of brackets for Duplo. It's a mix between Lego Bracket 2x2 - 2x2 Up (3956/35262) in 1x2 - 2x2 format.

The OpenSCAD code is borrowed from 247generator's adjustable Duplo model.