Thing is, I'm concerned about making the whole thing too complex. It's designed just to give a top-down glance of where things are stored, since most campaigns come as .vp files, and only need to go into the Mod Folder, I'm sort of uninclined to start going into too much detail without good reason, it's all too easy to start off with a file-structure and end up trying to make a Wiki in chart form, as it were.
To be honest, I'm trying to limit it to stuff that can be useful and not make it look so complex at first glance that it scares people off. Once you know the file system, it's pretty easy to understand, my own feelings is that the chart should reflect that
