UAV (elevon plane) mounting (pixhawk 2 the cube): connections etc

I'm looking for someone to help me with the mounting and connections of my in-house designed UAV (elevon plane) to a Pixhawk 2 The Cube. This UAV is large, weighing more than 5 kg. I may have some preferences for the brand or model of the elevon plane, however I'm open to suggestions. Additionally, I'm open to ideas for the mounting and connections to the Pixhawk 2 The Cube, however I do have some preferences. The successful freelancer will need to be experienced in dealing with UAVs , and be able to create an appropriate mounting and connection system for my particular needs. We are uzsing Ardupilot.