Hey there!
So that maybe required more communication on my part. The file that has been provided with this course are the result of what we cover throughout the entirety of this base course, not on a per-lesson/chapter basis which may be included in other courses.
The biggest reason for this is that at the end of the course, there is really just a camera or two, and a completed skybox shader which we can pick apart. I felt it made more sense to provide one completed file, rather than a couple individual .blend files with minor changes.
As well, this early lesson was more-so an example to showcase a concept above all else (it is not used beyond this lesson), and I believe was well over 1GB in file size so I did not feel I should include these files for sake of course-structure clarity.
If you want to download the files for this building, you can do so here!: https://cgcookie.com/p/collab-02
