I would give Traxxas a call, their customer service is supposed to be REALLY good.
As far as the tower it's self, I don't know if it's up to the task of the kind of abuse that the Slash goes through. Even if you're just doing some light bashing with the stock setup, that truck is heavy and a few roll overs might crack the tower... but I could be wrong. God knows it wouldn't be the first time.
~ Jason Kennedy ~
~ Sweep Racing Tires ~
~ TQ Wire~Wire~