Other than lighting up some windows, as well as making some changes and tweaks, the diffuse textures are done.  I redid the nacelle grill textures, as well as the impulse engine textures.  I think they're a lot better now.
I've welded the model back together and fixed up the mesh errors that occurred during the process, so the mesh is one piece, and seamless.
Best news?  Still under 20k polygons, and uses only 2 2048x2048 texture maps.  It's gonna run smooth as butter.