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Corpse Children: Ghoulish Body Enhancement

This patches the Corpse Children mod, allowing corpse children to enhance certain body parts by taking parts from dead or downed pawns. Corpse children can only enhance a body part if they are not missing the body part or any of the child body parts: if the corpse child is missing a hand, it will not be able to enhance its arm. Likewise, the corpse child will not be able to enhance a body part if the donor's body part or any of its child body parts is missing or injured.

After researching Prosthetics, the pawn can make the first set of enhancements on the eyes, jaw, arms, legs, heart, stomach, kidneys, lungs, and liver. Adding an enhancement in this way causes minor damage to the donor beyond the extracted body part, which may render additional body parts unusable.

After researching Bionic Replacements and if the pawn already has the first set of enhancements on a body part, the body part can be further improved. Adding an enhancement in this way causes major damage to the donor beyond the extracted body part, which may render additional body parts unusable.

A third set of enhancements can be crafted after learning a new tech. This new enhancement requires the corpse child to have the second level enhancement on a body part, and will remove the desired body part and the brain from the donor pawn. Adding an enhancement in this way causes major damage to the donor beyond the extracted body parts, which may render additional body parts unusable.

If you use Elite Bionics Framework, chuck that above this mod in the load order.

An issue was raised in the Corpse Children mod comments: upgrading the jaw leads the corpse child to count as disfigured in other pawns' opinions. This is a bug in the core game around jaw implants: not something that comes up much in Vanilla, but would hit with dentures. The issue is that when a replacement body part is added, child body parts are removed. For jaw replacements, the tongue is removed. Unfortunately, the game counts the tongue as a beauty-related body part, and if you're missing a beauty-related body part you're counted as disfigured.
* For an actual fix, grab the following mod: Bionic Jaws Are Not Disfigurements
* For a hacky workaround if you don't want to grab the above mod: go into dev menu, select Remove Hediff, and remove the missing body part for tongue. Better yet, do this via the character editor mod. But seriously, get the above mod and then you won't have to do this workaround.