True Assassin for D&D 5E (PEACH)

[DracoKnight]

So after reading this article (http://community.wizards.com/forum/player-help/threads/4149876) I decided to create a table to use the Assassin as its own class, instead of multiclassing to get everything to make the perfect assassin...Would any fellow DMs here allow it, or is it completely unbalanced?

https://drive.google.com/file/d/0B66RprYE6_HHYzVhaEtpS3Rodjg/view?usp=sharing

[Ziegander]

So full sneak attack progression + fighting style + action surge + extra attack? Yeah that seems highly unbalanced to me considering you give up essentially nothing (do you truly give up anything?) to gain all of them.

[PotatoGolem]

I'm gonna second Zieg here. Yes, you're losing the 3rd and 4th attack, but this still seems way too powerful.