Man if NRS really went all the fuck out and gave him the endoskeleton only as a skin shiny, a bloody or darker looking one too and a few different Cybernetic organism (with the skin over the skeleton) that would be freaking epic. Here's what I propose, every character has about 5-6 different looks with 10 different shaders/color variations.
So how about T800/Arnold model.
1. Standard (post burnt hair, shorter hair T1/T2/T3 with shades Look)
2. The T3/T5 half damaged/exposed face look, part machine underneath no shades
3. Full exposed endoskeleton look, no flesh all machine.
4. Old Terminator from T5(clean shaven) with or without damaged face
5. Old Terminator from T6(Dark Fate) with beard