The rudder trim on S-2's is set by a jack screw in the SERA actuator, it trims the whole rudder assembly a few deg . You really don't even notice it the same way you see a tab type move. Other than that, S-2's have no other fixed tabs on the rudder. The flight rudder is the rearmost segment. The forward rudder is locked in trail with the fin untill the single engine rudder assist hydraulic boost is turned on, wouldn't even worry about moddeling it.
Sounding great, looking forward to it!