When I built my Kougar, I used 3M77 spray adhesive and it worked great. Has never separated and the wing came out light in weight, also very strong. The formula for 3M 77 has been changed ( Uncle's orders) so I don't know how it works now. Titebond has a spray adhesive that is supposed to be foam safe...I have a can but haven't used it on a foam wing yet.
I did all the wood carving and shaping out side in the back yard....looked like a saw mill after I finished.
Mine is powered by a Scorpion 3026-10 on either 4S or 5S. 65 A total.