That is true. Or, you can lay them down on top of one long piece of aileron stock and cut new ones. Or, you could join them with CA. I would use fiberglass, though. You'll be getting pretty thick there in teh middle. Instead, consider using small brass tubing glued into place holding the two together. Drill a small hole in each aileron, and slip the brass tube into the hold (like a wing joiner), and epoxy together. You'll not have any problems at all with that setup. However, remember that now you have a large surface, so a little more servo will be required.