Or at best it's a rough draft that got released prematurely before the kinks were worked out.
This might be a distinct possibility. It doesn't scream "obvious fake" to me, but then on the other hand certain details are missing as you thoughtfully pointed out. A fake---to be convincing enough to trick the Trek community as a whole---would likely include some of the details you mentioned just so the Photoshoppers could cover all their bases and avoid early detection of fakery. If Trek fans with Photoshop skills are anything, it's anally retentive. Trust me. I've known a few over the years.
If not the official first poster, it might be a Paramount first run/draft that leaked out.