So I went back to your fine project and tried, once again, to figure out how your source code is laid out... My thinking now is that I need to save up for air fare over to Germany and get a week's worth of training on this codebase...
Another possibility could be to take a look at some of the courseware written by the folks in Dresden for their courses. One can learn a lot about the codebase from the comfort of home. I'm currently doing this on my own in my spare time with the hope of doing something L4 related in the future here at UTEP (University of Texas at El Paso).
-Ryan