Ed,
Thanks for your input. If I remember correctly, the 40 size wing was intended to be built it one piece. If you want me to, I can mirror the wing half shown and send you a PDF so you can have both sides to build from. The plans I made the drawings from showed the CG on the 3/8" spruce spar. Also, it probably wouldn't be a bad idea to add shear webs all the way to the wing tip. Hopefully Toprudder here on RCU can correct me if I am wrong about anything.
Fly safe and have fun!!
David