OK, we've talked about spars, now how about rudder construction? What are the building techniques used and what are their advantages and disadvantages? I can think of the following:

1. Traditional thick balsa outline with balsa cross pieces (which is what I ended up using on my EIII)
2. Curved multi-layer ply with epoxy
3. Wire (with soldered cross pieces)
4. ?

In the case of my Nieuport none of the internal structures will be visible because I'll be painting it black but I'd like it to be as strong as possible to handle those inevitable nose-overs and yet light. It really is a massive rudder hanging off the end of the airframe!