Hello...
I'm fitting 2 JR DS8711 on the elevators, JR DS3421 on the rudder, 2 JR DS9411 on ailerons and 2 JR DS8411 on the flaps...
Elevator and flap servos aren't a problem because virtually any servo can fit so you can choose what you prefer.
Rudder and aileron bays instead are quite small and I've been doing quite a lot of research to find the most powerful servos I could fit there...
The DS9411 are definitely the biggest I could find and that fit for the ailerons.
For the rudder you can choose between DS3421 or Hitec HS-5245 if you prefer...

Mauri, Italy