Nope. Not even Starkiller base is match against the guy, who can rip the planets in parts with his bare hands and destroys armies of enemies with his brutal strength. Only the Matrix of Leadership can defeat Unicron.
The Force? Please! Unicron can give Vader a new form in exchange for total loyalty. Also. don't forget, that Unicron can torture his slaves on distance, which Palpatin could not do. On the top of that, Unicron is a being that filled with anti-life energy called Angolmois, which is uneffected by the Force. Vader maybe numbero uno in the Galactic Empire, but Unicron is a GOD! And not even the Lord of Sith cannot compete against the god.
You are an incredible artist this is epic. the empire and the rebellion putting aside of their conflict to stop a bigger threat the one-time good guys and bad guys unite against the common foe in the starwars universe the threatens both the empire and the rebellion and perhaps the fate of all the planets in the galaxy.
I have been busy but read the fan fiction have gotten past the part where R2 kills Skippy the Jedi droid(SW joke comic) and Arcee meets Obiwan.