^Not that I doubt it or anything but it seems a little odd that they'd use fanmade assets like that, especially since they reportedly had access to the show's actual lightwave meshes.
I can only assume that the Guide to B5 was produced really early in the development cycle. The trailer lists a release date of Q4 1998, but the most recent release date before the cancellation was a year and a half later than that. There was so little game-related content, my guess is what little there was came from before Netter had sent the original models on to them.
, where exactly is the downloads section on your site where you can find the originals of the ITF drawings?