I've been looking into this - actually spent weeks on it when I was doing the Grim Reaper.

The problem is that there isn't a selectable face category to clone anything from in order to make use the facenull value. I made a hairnull file & it works fine but because we can't actually choose a face even if we make the facenul file there's no way for anyone to choose it :/ I tried manipulating the make up, too. That doesn't work because it's only an overlay file - it's not the same as a skin file. If there's anyway to get this to work it'll have to be through some manipulation of something like the Vampire Full Face "makeup" - that's the closest face thing that can be selected. I will look into that some more & see if I can make that make the face disappear.

Blink13y made some invisible & headless sims (see simSlice web site) & those files work perfectly in Body Shop & CAS to construct a servo, but there isn;t any way to choose them at a mirror :/

I tried everything I could think of. I can construct new servos in CAS or BodyShop but there isn't any way to get rif of the human face in game, it has to be done through SimPe. I need to do some mre investigating to see if I can change some of the values to change the mesh overlay to make the face disappear.

LOL - I even tried making a new face archetype but that didn't turn out too good either.