This short video shows what I did to your model...I also added a slightly different method to the leading edge of the wing, to get what "I" thought was a better surface.. But not needed.. Basically just showing the making of 2 solids that will union properly for a fillet.. An n-sided patch is need to finish off the trailing edge.. I cant tell you how many times I need that command!!! :o (still havnt purchased Rhino)