Hi I am a new member. I have an amateur built PA11. It was a certified PA11 and has been converted to amateur built and the original owner made some changes to the turtle deck that I don't like. I am recovering the fuselage. It has not been recovered since 1961. My question is does the turtle deck on the certified version use plywood frames and wood mushroom stringers ? Or does anyone have drawings or pictures of how it is constructed ? Thanks