I newly developed a fixed wing drone with Bixler 1.1 from hk.
Below picture is autopilot cockpit module I designed for pixhawk.
I had to extend front section of the cockpit from its original length to fit longer pixhawk into the cockpit.
Also note the GPS mount and pitot tube mount.
When finished, all the components are nicely attached to the cockpit as shown below.
Most of the components are mounted inside the cockpit and I hope this may help reducing the drag if mounted externally.
Hope I can report some good news later.