I make the cores of this plane feather cut. And the ailerons are cut after it is sheeted. I cap them with 3/8" balsa where the hinges go and cap the trailing edge with 1'/4" balsa. The leading edge of the wig is capped with 1/2" balsa.

I glass the sheeting on the cores with 1/2 oz cloth and very little epoxy . I spay the sheeting with 3M 77 contact glue, a very quick light pass is all you need. lay the cloth over the wing and smooth it out with a credit card and a light touch. I do this because it totally elements to bubbles and wrinkles I used to get in the cloth. 1/2oz cloth is so thin it pulls and wrinkles to easy when sliding the epoxy around with a credit card or squeegee .

I built a couple of bulkhead to mount the Air tank and the servo tray and glassed them in. The are 1/8" light ply.