Mating complex shapes

Hi,

I'm trying to connect the interface between the spars and ribs of my UAV, but I can't seem to mate it since it has the shape of my airfoil. Is there any way I can easily mate these two parts? I have tried using sketches, and all kinds of mates but nothing seems to work. I apologize for not uploading the file but I do not know my class' policy on publishing our data since we are sponsored and are planning on competing, Any help would greatly be appreciated!

SolidworksAssemblies