I made one myself. Just get a piece of wood the same square as the trailing edge of the wing (I think it's 1/4" square, although it may be 5/16"... it's been a long time since I did this so you'll have to check the plans to be sure ) Measure the points at which you want your hinges, then drill through the length of wood dead centre vertically, being sure to keep the holes perpendicular (this is what I used the drill press for.) You can then drill holes in the trailing edge and aileron by carefully clamping the jig onto the piece, then just using the jig's holes to guide your drill bit.

Cheers,
Neil.