I have parts allocated as 'Hair' and parts allocated as 'Jaws'.

Hair is hair, bunnykin ears, skelekin horns etc. Jaws are skelekin jaws, apex beards, avian beaks, novakid brands, long noses etc.

The eyes are a head sprite replacement.

So you can mix n max hair n jaw styles, but you can't have 2 of the same kind. For the eyes, if you sub to the mod, all mannikin will have eyes.

Is it possible to have multiple of these Mannikin Heads applied at the same time? Let's say I simultaneously wanted to use a Human head, a Novakid head, a Glitch head, the Cute Eyes and the Noses in one character. Would that be possible?