The wider portion of the aileron goes closer to the fuselage, so you are OK. If you ever need to re-hinge, cut the old hinges through and leave the pieces in the wood. Cut new slots for the new hinges away from the old ones. it is too hard to re-slot on top of the old hinges.

Put the slits in the hinges perpendiculer to the span of the wing. So it is like you are using two narrow hinges side by side. I'm not totally sure about right and left. There is some dihedral in the plane, so it would seem that the root rib of the wings (that end up joined together) would be angled such that one wing is clearly left and one is clearly right. I guess they are covered the same top and bottom also?