The flight control surfaces on the B-29 were fabric covered. (rudder, elevators & ailerons) The kit controls are fully sheeted so to simulated the ribs I added some rib tape to the elevators and ailerons for a little more detail. The rudder when built came out undersized. So I had to add some length to the back. I also added some balsa strips to simulate the scale ribs locations ( see previous post pic) and covered with fabric.