Honeycombing the outer 1/3 gains about 1 ounce per wing panel, 2 ounces off the total plane. About 56 grams or so. It's not quite as effective on the tail surfaces.

But the real advantage is not so much in the weight savings as moving the CG of the wing panel itself more toward the centerline of the plane. Less mass in the tips, better the snap and spin.

-Mike