32x16 LED Matrix grid for diffuser

I bought 2 8x32 WS2812B Matrices and wanted to put them togehther. Ispired by https://www.thingiverse.com/thing:1903744, I first tried to change it in Sktchup, but then quickly moved tawards OpenSCAD. As I was new to it, I used https://www.thingiverse.com/thing:29211 as a starting point.
The Matrix is printed in two parts (twice the same model) to fit into the Printer.
In the OpenSCAD file you can change some parameters to fit your needs:

// overall size of X dimension
allX=188;
// over