RE: Pfalz DIII resources -- Photos, Drawings, Plans, etc.
Seth, I just checked on that famous photo of the striped down Pfalz in the Pfalz Aircraft book and you're right that the elevator section was clearly "triangular." You can see the wedge shaped ribs (wood? metal?) quite clearly. The rudder does seem to be entirely flat.
Alan, I think the problem here is that we're discussing several different levels of scale modeling all at the same time. A "flat" stab and elevator (with perhaps a bit of sanding) would be just fine on a sport scale model.