200X Evil seed would only need 5 New pieces:
Head, Torso "Armor" and "Loincloth, and Weapons
Using the Clawful base Troso, Snakeface shoulders, King Hssss Biceps and Thighs, whiplash forearms, Skeletor's right hand,Spikor's left hand,Demo man shins and feet.
Having the vine-based weapons plug into his left arm a la Spikor would give him a sort of action feature as well.