I don't know about the wing vs wing saddle thing.

As for hinging, I use a combination of bi-di tape strips and regular packing tape on my hinges and it works great.

What most people do is set the aileron on top of the wing, with the TEs flush, or the aileron hanging off maybe 1/16th of an inch. Now run a strip of tape from root to tip. You're taping the aileron on to the wing. Now, flip the aileron down, hold at full-down, and run another strip of tape from root to tip over the top of the wing and aileron. In an ideal world, the tape just touches the tape from the bottom, and you get a decent aileron hinge.

My way of doing things takes more steps, but I think gives a stronger and more stable hinge.

I cut 18 strips of bidi. I use 2" wide tape, so the strips are 2" by about 3/4" to 1", but the width isn't critical. Take two strips, and overlap them glue-to-glue about 1/4" or so. This gives you a 9 strips of tape with sticky "up" at one end and "down" at the other. Now, put one strip on the bottom of the aileron at the tip and one at the root. You want hte overlap or non-sticky side to be at the aileron LE, but it's not crtical. Hold the aileron against the TE of the wing, and pull the tape up and stick it to the top of the wing. So the tape is now stuck to the top of the wing and the bottom of the aileron. Now add two more strips, alternating direction. Finally, add a set of 3 in the middle of the aileron. Once that is done, flip the aileron up on top of the wing, run a strip of packing tape from root to tip. Flip the aileron down, and run another strip on top. These strips are to help protect the bi-di from fuel and UV, and to make things look better. They also seal the hinge gaps.

There are some pictures on my Rapier build instructions at www.midatlanticcombat.com, around step 20.