I can't help myself, had to butt in. The tail assembly would be a lot simpler if the root sections of the stabilators were perpendicular to the axle. Why not build out that area of the fuselage to "square things up" first? I would use as large a C/F axle as you can get in there and stuff it with birch dowel. Then use tempered aluminum knitting needles to pin the stabs to the axle in a couple of spots. The axle can ride in maple bearing blocks that have been greased. I use a similar set up in a 1/2A sized propjet and DH is right, use the inner hole of the servo arm and go with a nice long control arm on the axle.

Hopefully this drawing is good enough to get the idea......