The QGroundControl dev team is currently hard working on the integration of more autopilots and the 3D outdoor view. In line with these efforts we would like to add more CAD models of airplanes, helicopters and other MAVs to allow users to select a CAD model close to their aircraft.
If you have a CAD file (.step/.stp or .iges or any other common exchange format), please send it to <firstname.lastname@example.org>. Please note that the CAD model will be included into the GLP-licensed QGroundControl application. If you send it in, please do not forget to give the name of the model and the real/physical size.