Here is a 3d model to one of the plans in the 14 frames book:

http://sketchup.google.com/3dwarehouse/details?mid=61e0f99f90ba04d3ca7d9a9cd1666d04&prevstart=0

The author of this model used it as an example for teaching how to use SketchUp to design timber frames.

When you get your book you will have a better idea about the size and scope of this pavilion.