The zones were originally written for rendering with DirectX and it differs from OpenGL on the direction of the Z axis. Scaling your model view projection matrix by -1 in the Z direction. Then you need to make the front face wind clockwise and cull the back face. That should do it.
Are you using Blender for viewing the models or are you using it as your graphics engine?
The more projects the merrier. If you are interested in helping, I will hustle and get this github. Regardless, the more information that is out there, the better.
Cheers
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