This video shows the FrSky X8R S-Bus receiver, and Wookong-M flight control components mounted on the F450 central boards.

The extended arms used in this build make this a 550 class machine, however.

Unhappy with the slop in the fold over GPS antenna mount, I modified the knurled knob, so that it was a tight fit with the internal fold over mechanism. This eliminated the slop.