A few skulls have visual features that communicate what they can do, or are components of its powers. Each skull and skeleton is also designed to allow its bearer to be described in a new way, a different variant of Nekroborg. But these are constraints you do not need to abide by and if you don’t they can be changed or re-flavoured.
One option could be re-flavouring your skeleton as Internal augments and Skulls as External augments. (Grafts as auxilliary augments maybe?)
- Internal augments determine the silhouette/skeleton of your body. You have disturbingly thin stilt legs and a cubical abdomen. etc.
- External augments is what your internal augments are wreathed in. Synthetic musculature clad in reactive-camouflage chrome etc.
No matter how you do it, I don't think it'd be possible to do a 1-1 conversion, you'd need to change quite a bit of things that come out awkward. Finally, if you’re doing anything vaguely transhuman SF I would recommend looking into using Eclipse Phase art as they have a very generous license for it.
- Play around with the links here for images: https://eclipse-phase.fandom.com/wiki/Morphs_1e
- https://www.eclipsephase.com/cclicense/