What I did was I took the current SCP-096 model and made a new texture and transformed it into SCP-513-1.
You can view the main texture sheet here:
Spoiler
Here is the texture applied on the model here. I used a different texture for the eyes aswell.Spoiler
And last but not least: The download linkhttps://www.mediafire.com/?rpb6t6igy67v9dq
(To Regalis: You don't have to put this in the game. Its just an idea! )