Well, the answer is interesting, but that's cranial containment units, drone bodies, and brain-in-a-drone cyborgs.
I still want internal organs in a cyber torso, for whatever reason. 
Are partial skulls obvious or synthetic? (either?) Why do they have as much capacity as an obvious cyberskull? (4)
Where does the [8] capacity False Face fit? (ditto [6] capacity junkyard jaw?)
Partial skull is Obvious (It's the classic half-head chrome plate from, like, a bajillion movies) and is designed to have stuff added to it, thus the higher capacity. Ideally, you'd plug several Headware upgrades into it, or a single Eye and a single Ear, and so on.
The False Face and Junkyard Jaw capacity ... d'oh. That's still in there from an earlier draft, where I could have *sworn* that the Cyber Skull had a Capacity of 8. My bad.

Might be able to get a mod-friendly Skull in the future that could handle them. That one's on me.

And I *nearly* added a whole suite of internal organs, but backed off as time was getting TIGHT and my wordcount was already obscene. Who knows? Maybe we'll get a yearly book like before (The SOTA series) and I can slide 'em in then.
I, for one, would like to see the Skull and Torso get their Capacity increased so that you could stuff more toys in there.