If you work with wood you might already have the answer in your tools. i.e. a router. Make a quick jig so that the front edges of the wing are even with a straight and even with the edge of your jig and use the smallest round over bit and set yout router so that you cut one half of the edge and then flip it over and make the other side of the round over. If you know a machinst they might have a bit that you can put in to your router also. All thesugggestions are good tho.