Download the file called SmallBuilding12.zip and extract it to your hard drive.  Double-click on the HTML file to play the video back in your browser. 

Keep in mind throughout these tutorials that although we are creating a small building the tutorials are actually more about workflow than the building itself.  This roof example is to illustrate how to set up a flexible workflow that allows you to modify simple 2D shapes to affect several complex 3D objects. 

As you perform the exercises you should be thinking about how the techniques can be adapted to your particular scenes. 

Good luck and have fun
Ted