Ventilation grill designer - fully customizable

This Thing is a fully customizable ventilation grill designer, that allows you to construct a wide range of ventilation outlets based on svg files and by modifying some parameters.
Note: If you plan to make just rectangular or round ventilation grids, you instead may use my Thing: https://www.thingiverse.com/thing:5188211

It introduces the following features:

* A nearly endless number of shapes are possible due to the grill frame form is based on svg files - these are widely available.
* Possibility to make straight and/or slanted grill ribs to control the direction of the air stream.
* Almost all size parameters may be customized by simple parameter entries in the OpenScad Customizer.

The Download section comes along with some sample SVGs that will be mostly used by the samples in the .json file
To see the samples load the zip file from the files section and unzip into one directory. Then start OpenScad and load the file "ventilationgrid_SVG.scad" from thhis directory.
In the cu