It's a Friday afternoon for me so I have some free time, :)
I had a look over the blend file and there was no geometry object, same with the P3D, at least no yellow bound box like with my usual geometry layers in oxygen, that could just be my copy of the tools though, they have been a bit finicky lately.
The shadow volume looked fine.
Geometry layer wasn't present in the P3D or the Blender file.
I wasn't sure about the textures, in the textures files and inventory those were Icons? either way Ill take a look at the model and getting the textures slapped on, also have you looked into RVMATs for texturing as well?
As for your code well, I have absolutely no idea about that.
I'll take a crack at getting the model working after I finish up some work and have something to eat.