Took Marvel Legends Captain America Infinity Endgame figure and repainted the standard green and purple.
Took a Punisher Hit Monkey wave head and gave him a short, short hair cut.
Dyed his eyebrows orange and voila you get Lex Luthor.
The Frank Castle face already has a scowling face, so it was appropriate for a menacing, evil, Kryptonian hating villain.

A shout out to WeaponXCustoms. The Fantastic Four he did was an inspirational for this DC villain.