Water wheel with venetian blind slats

Parametric disc for repurposing plastic venetian blind slats from trash in a small water wheel, Banki-Michell style turbine, and eventually in an electricity generator.
First version in SketchUp more than one year ago, I publish it now, converted to OpenScad so you can describe your own slats, change the blades orientation, etc.
I'd love to see those disc cut out / milled of unused CDs or DVDs because trash cans are full of them (I don't know if it's possible to lasercut CDs on the non refle