Here's the Photo of my FC40 - upgraded with Remzibi OSD , external GPS module , bandy legs , 2D gimbal - Controller is now 2.4 Ghz and the OSD runs at 5.8 Ghz ...Sorry but I chopped off the GPS doohicky at the top of the pole .. See the link below for what it looks like ...
Here's the link for the GPS ( I know it says its for the Naza Lite but it works fine on Naza M too ) ...
http://www.banggood.com/DJI-NAZA-Lite-Version-Multi-rotor-GPS-Module-p-86239.html
The reason for the external GPS was to make room above the Naza M for the Remzibi OSD board ...
In case you're wondering why the OSD monitor has a black background - Its because the camera lens cap is on to show the OSD data display better .. Mandrake