Make battlement squares and turrets.
For battlement squares, roll out 20 oz. light gray fondant 1/4 in. thick. Use smallest square Cut-Out to cut 12 squares.
For turrets, roll out dark gray fondant 1/8 in. thick. Cut out circles using the wide end of tip 2. Using damp brush, attach around bottom of turret and overlapping, working your way to the top.