Around 1970 or 71 when I got my first Kaos, I flew it with the built up balsa wing for awhile. Then I saw a ad in either RC Modler or M.A.N. that showed a complete glass covered foam wing, I ordered one and when I got it, One of the wing panels was warped. I sent it back and the new one was perfectly straight.
I glued the wing joiners in and slapped some slow cure epoxy on it. Then when it dried. I glassed the center section and flew the Kaos. I seem to remember that it flew better with that glass covered foam wing . (I won my first pattern contest in class A with it) I often think about building another Kaos and probabley will some day when the mood strikes me.
I'm really enjoying reading about your build with the Kaos. It brings back fond memorys of when I was building my Kaos and chewing the ambroid off of my fingers, while I waited for the glue to dry.