The flap linkages are nicely made ... no problem installing them.
I used generous amounts of epoxy mixed with microbaloons to make sure the hinges stay in place. The flap horn fell apart and had to be re-glued together.
It looks like a cool setup. I just hope one of the two flaps won't fly off in flight
I needed to cut down a hex key to get it to work in there. I used twin HS-81 MG I already had lying around. They are good, strong reliable servos, and fit perfectly.
It is a good thing that the flap linkages can be properly adjusted. Later everything will be set permanently in place with dabs of epoxy.
Flap operation video :