Configuring CT Apps and Services_Final_060418 is overall a great guide, but are (some of) the pictures only meant to be an approximate guide or are they meant to show the actual (more or less) location, i.e. see attached picture:
This does show the Storage model, doesn't it?
I am fussy, but there are some other section in the guide, where I am not sure that the sentence makes really sense - let me know, if this is worth following up or is an ongoing work in progress, anyway.
As said - good guide, good lesson!