After reading what I have available about the D.III's, mostly in the Windsock publications mentioned by Bo, I'm getting the impression that all D.III's have been wing-warping versions when they were in active service in the German forces. The performance was not really good and the D.III was withdrawn soon. After that some 10 pieces of the D.III have been sold to the Netherlands and all of those had an aileron wing, but some must have been retrofitted with that wing as they had early production numbers.
So it depends on which D.III you would like to build. It's my idea that aileron versions have been pretty rare, at least in seeing action.
regards,
Ivo