Most models are ok when I was checking recently, but we must decide what to do with all that alternative versions + smooth shading are required in several parts of the mesh.
@tomangelo : I think you should do revision of all models first, we have not so much time for implementing all those models with next GOLD version, so we should try implement as much as we can with smooth shading.
About the author Bernardo Iraci of the book proposed by @tomangelo : "In 2010, he moved to Warsaw, Poland, where he was finally able to start working full-time in computer graphics as a 3D generalist in the field of movies VFX and advertisments. He also started work as a freelancer."