Hi, here is the final version.
As far as I can see and tested it extracts everything correctly, some files have duplicate mesh data at 2 different places, in these cases, only one gets exported.
When I have some time I'll write documentation on the layout for future use, I still can't figure out what the extra section is, it seems like transformation data. But it isn't needed to extract the mesh, so I am conveniently ignoring it, though I am saving it as "normals" in the obj file that is generated🙈😁. These normals might not be of any use to anybody. The can be easily removed from the script or the .obj in question.
WGG_convert - Final.py