Here is my results, I'll send you a link to my ship soon!
You know, I'm not sure which one did the trick, maybe the corrected Normal map, or the material assignment. So if it was the last one, then we can use Zedi's normal maps. The results will change a bit but I think with this setup we have all the functionality and no bugs.
PS. The last image has the shadows of the railings showing, but it's not a bug, this ship uses two textures, and the other one has railings painted in it's textures. So the sun enchances the railings, but with this texture, it's a bit weird.