I originally posted this along with some other aviation items in my introduction thread, but it is more appropraite here.
This cockpit section is from a German plane downed near Noviant, France in September of 1918. The plywood is Birch, the reinforcement ring is made of Ash and the underside reinforcement strips are made of oak. The method used to join the plywood joints together is called scarf joining. This is a very finely detailed piece of work and on the underside, it is vary hard to see in some areas.