In a previous post, our friend montu said that he already hinged the rudder to the fin, this make me think that we will have some more problems. As I already said, I never builded the ARF SE , but i made several kits. In the kit version there is a hinge holding the rudder to the fuselage. What I usualy do is to glue my elevator assembly (hinged) and then then vertical fin and after that I hinge the rudder to the fuselage and fin.
In our case montu will have to glue the fin and rudder assembly to the stabiliser AND DON'T FORGET TO INSTALL THE LAST HINGE OF THE RUDDER IN THE SAME TIME .
On the last pic montu posted, I can see a hole were the joining wire go trough the fin trailing edge, this hole have to be enlarged till the end of the fin trailing edge, otherwise it will be impossible to install the rudder and fin assembly.
all my speculations are based on the fact that the ARF is close to the kit version