I made this low-medium poly 3D model recently entirely in Blender and it is not textured. As you can see it is only colored somewhat with different materials. There are two versions of it in the zip file, one is like this cause the mesh has been more divided for the coloring and markings (done directly in the mesh) and there is a complete white version with the mesh more clean for texture mapping and better welded together.
I think that I got the overall shape of the craft well and this was not easy due to how hard it is to get good quality reference material for it. I searched very hard for many pieces of blueprints and many, many photos of the original studio models or of close replicas of them and I used that material for reference.
Remember that it is low poly and many compromises have to be made for such 3D models. With textures it would look much, much better. I originally designed it for the AC3D screensaver. There is another submission in Deviantart (search PixelOz in Deviantart or in Google) where you can download my mods package for the AC3D 3D screensaver with many models that you can use with it (they were all done in Blender but converted to the .ac format).
More details about the model are specified in the PDFs included in the .zip file and there are more images of it there too.
The model is completely free and you can even use it for commercial purposes. The complete details and restrictions are specified in the accompanying PDF documents.