After hinging the plane (CA hinges on the wings and stabs and removable pinned hinges on the rudder), I moved on to the servos.
I made servo plates for the wings and stabs. I have access to a laser machine so I brought over the file and some 1/8" lite-ply and got them cut out. Once fitted to the servo boxes, I aligned the servo so the arm was inline with the horn on the surface. Then I tacked them in a couple of spots with thin Zap and then ran a bead of medium Zap around the top and bottoms.
Once the servos were in I mounted the horns on the surface, lining up the pivot point of the horn over the hinge line. I offset the horns 1/8" from the edge of the servo itself.