First of the 2 edf's installed in the nacelle former, then this assembly was dry fitted on the wing's bottom at the main spar's location. Now this sub-spar will be butt joined on the back side of the main spar at this location. In the side vies shot, you will notice, edf's are pointing down by -1 degree, this is how it's on actual Concordes, this pitch down angle helps lift nose and long fuselage faster by pointing thrust at an "UP" angle.....Since this is 12th scale model with 11 of the fuselage infront of these edf's is sensible to mount this on scale angle....