@Hunter 2.0 ive noticed the same thing some times on various costume sets seems to happen if you have stubble toggled on or any facial hair when i just removed all my hair this problem didnt happen this may or may not help you but there ya go anyway.

I did all I could to have this skin work, but when I try to put it on the head looks transparent along with a few sections of the body

If possible could you add "Ghostface - COD BO Cold War model"?

love your work, wondering if you could do combine soldiers from half life