Used my new cheapo HFT belt sander (4x36") to clean up bandsawn edges of rudder stiffeners, round the 90 dep corners, and take most of the shear marks of the "as received" edges. Took on of the stiffeners to the 3" scotchbrite wheel in the drill press--edges polished up real nice without tearing up the wheel as much as was the case when I did the practice aileron section.
Still need to finish polishing the stiffener edges.