That's really interesting, and well spotted! Loved Primal Rage on SNES back in the day, despite playing like treacle.
As for what's going on there, I'm not sold on it being an official project. The environment had a decidedly "home workshop" feel to it, so it could simply be a passion project or one of the many fan sculpt/prop operations we've seen over the years.
On the other hand, it may very well relate to work on a project we know of, or perhaps one that was canned before it ever saw the light of day. Given the videogame connection it might be something to do with Rebellion's original AVP on the Jaguar. The sprites in that game were created by rotoscoping models, if I remember correctly.