Back in the Bad Old Days there was a Pfalz D-IIIa plan and construction article published in the June 1971 issue of Flying Models Magazine (plan no.223, by A. Spievak).

Although it was only 1/6 scale, you might find some useful info there.

There is also a new kit in the works, in 1/3 scale. Check here: http://www.rcuniverse.com/forum/rc-s...-offering.html.

Again, that may provide some useful information.