thread piqued my interest so I've started blocking out a model fit to M4 (I don't have m4 but am using a bodysuit proxy for measurements, thanks Joe_Quick!), it's all very in the low assembling stage at this moment but I haven't run into any design problems at this point other than I'm going to have to use a displacement map for the eye corner tear divit. Not enough geometry is going to be there to model the divet. I'll fit it to M3 and V4 when it's done. Also, I'm going to take some minor design liberties but I'll try to keep with the newer Cyberman aesthetic overall.
I'll keep you posted here unless I get too frustrated...