Erm, Tore that on the drawing is the stern hydroplane mechanism (you marked it as pillewerfer), however i think best possible location for Pillewerfer would be on that spot, unless if i make some extension, or i could make it separately, and then decide where to put it, and how to attach it. Or, in theory i could lean it to the last flange of the Junkers compressor, which would not be entirely accurate, but would follow the flow of the parts..
here is approximate position of the pillwerfer, im not exactly sure how would this fall out, basically its a tube rotated 90