Hi guys and thanks for hte comments.
Bo, I think these blast troughs were field fitted, I used what ref pics I have to construct something I thought looked okay. I'd noticed them before ages ago on pics of some Albies but wasnt sure then what they were. (for a while I though it was some rudimentary oil scavenging device) The archive pics on the WNW website for the decalset provided a few details to add to the build as a whole too.
Dave, the figure is from Andreas miniatures, he came with their Dr.I resin kit a long while back, I don't think he was released seerately maybe if enough interest was shown they would consider relasing him again alone.
Thanks Keith