how to add a ptu to fixed-wing UAV in Gazebo 5, or who has the ready-made model.

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I want to add a PTU (a camera with pan-tilt) to the fixed-wing UAV. However, I can just have fixed-wing UAV and PTU separately, and have trouble in fixing the PTU in the body of the fixed-wing UAV. Therefore, I hope someone can provide the model of fixed-wing UAV with PTU. Thank you very much.