The rest of her modernization was along the same lines as Marat'''s, except that the latter's tubular foremast was replaced by a sturdier semi-conical mast, a new aft structure was built in front of the rear conning tower which caused the mainmast to be moved forward, her forward funnel was curved to the rear to better keep the bridge clear of exhaust gases and the thickness of her turret roofs was increased to 152 mm .