The main Idea for this design in my head was that if Afton looked more realistic(not like a peanut) and have somewhat of a realistic take on the animatronic aspect.

So looking at different types of "real" animatronics, I made Springtrap look more like it, his face, ears, and stomach are made of a rubber like material, and the rest is fur, the spring lock design I decided to add a bit of rust to and slight dents, bent wires, ect...

Fun Fact, some real animatronics with this type of mask, if they have a large muzzle, they would get a the "Melted mask" where the mask gets worn out and gravity causes the snout to go down.

I decide to go with how Dave looks in the Graphic Novel of William for his design, mainly because this is the most accurate representation of Afton. But I did thinking of him more like a zombie, even though he was trapped in a room to rot, I made him less decayed, as if him still having some life slowed the rot rate by a lot. His chest has been opened by the suit, revealing his heart, which is slightly purple. I also thought of a design of the mask, where the top muzzle is cracked and he can lifted open just enough to be seen inside.

the eyes I based of the original, but wanted to make the other one red to implement anger, and make him look more like a monster. The eye sockets also are cracked due to being wared out. The main part of the Spring lock suit is a framing, and not much like the original, and I just want to say, I HATED the original's feet, a brick with muscles on it. so I made sure he is till wearing cloths, shoes, ect...

and the rest is simple, fur suit with dirty marks and burns.