Took a swing at this myself, please see: https://www.blockscad3d.com/community/p...

		WillAdams 5 days ago \| parent \| context \| favorite \| on: OpenSCAD: The Programmer's Solid 3D CAD Modeller Took a swing at this myself, please see: https://www.blockscad3d.com/community/projects/1814083 which is mostly parametric --- only the placement of the rounding of the last radius is hard-coded/fudged.