The inner frame piece of the elevator halves on this model are hardwood; it's what they intend for you to screw the horn to. I thought that was a bit flimsy, so I cut into the covering and added a square piece of hardwood glued into that corner, and covered it with some whit UltraCote.

Now I have lots more "load-bearing" hardwood, if you will, and I was able to position the horns properly over the hinge line. I was a bit wary of those hinges, as they seem to be mostly paper, but used them anyway. I haven't finished nor flown the plane yet (too many other projects to finish first), but I hope my trust in the hinges isn't misplaced...

Steve