Each modeler has his/her own method for attaching the top wing, what works for one does not work for another, so you use the method that you feel comfortable with. Here is the way I fix my top wings, it has always worked well for me, so far.
Firstly, I check the fit of each strut into the holes in the wings to make sure that they are going to be a good snug fit, the holes may need to be enlarged slightly and make sure all paint is removed from the holes and the pins. I fit the struts to the bottom wing and the cabane struts to the fuselage ensuring that they are at the correct angle, I run a straight edge along the top of the struts to make sure they are aligned properly. I also fit all the rigging attachment points to both top and bottom wing whether it be eyelets or turnbuckles. I place the top wing upside down on my bench with appropiate packing under the wing to retain the dihedral if there is any, I then invert the model and sit it onto the top wing, you may need to pack under the tail to keep the model level. I align all the struts so they fall into the holes in the top wing, at this point they should all be sitting nicely in the holes and sitting home. Once I am happy with the positioning I apply a small drop of runny CA around each strut, the runny CA will run into the hole and around the pin giving a very solid bond. I usually start from the cabane struts and work my way outward making sure each strut is firmly held into the hole before the glue is applied. Super Glue dries very quick, in a matter of seconds, but I leave the model in the inverted position for at least an hour to make sure the glue has fully cured.
I then turn the model onto it's wheels and rigging can commence, I use mono as my rigging so this adds a great deal for strength to the wing assembly, some struts can be very flimsy hence weak.
Des.
