I've ended up rebuilding the Guardian Sphinx model using the texture layout sheet found on the sentient forums. I know frontal textures are correct, however regarding back and side textures, I know they are incorrect as there are no references available.
Will try a few other configurations for the side texture layout. (if push comes to shove , I may also have to make some custom textures)
The texture sheet
Man this guy does not look like he would be as big as shown in the concept. If it were, than I would imagine the textures would be very very pixelated.
Perhaps he was more or less a mini version of the boss found wondering around the levels? ( the cubes he is made out of could be the same size as the level cubes)
Hmm.....than again this is 1996 we are talking about. (Also note: Crap I just caught this,,,,,,the name is Egyptian Sentry and not Guardian Sphinx)