If you study the photo closely you can see the lightning holes in the wood on the inside of the plane. Look near the back of the canopy. I do not know how to achieve this mirroring effect but it is probably done in much the same way as making mirrored sun glasses.

Edited to add: I went to HobbyZone and looked at the Fliton pics of the plane and those are the servos you can see in his pic near the back of the canopy.