This is another example of how instructions in a book are not specific enough to accurately complete the project. I have been doing some research on Star Books. The instructions in one book clearly stated that the difference in page size between layer one and layer two has to be one half of the difference in page size between the second and third layers. In other words, if the first layer has pages that are 1.5 inches and the second layer has pages that are 2 inches then the third layer has to have pages that are 3 inches in width. Theoretically, this is correct but unfortunately, what they don't tell you is that a 1.5 inch pages does not adequately allow for the book to open into a star. After a lot of trial and error, I realized that the second layer should be .75 inches wider than layer one. Also, the double rule of the second and third layer is then still applicable. In other words, if your first layer is 2.5 inches wide, the second layer should be 3.25 inches wide and then your third layer should be 4 inches wide.
(l)Lots of trial and error
(r) Even more trial and error
One important aspect of this project is the need to use lots of scrap (i.e., inexpensive paper). Because of the need to build several prototypes, it would be unfeasible to use your expensive paper on making models. I always make prototypes beging committing to a project.
Here is my paper pile for the protoypes. The orange and yellow paper was on sale for ten cents a sheet--perfect for prototypes.
(l) Here is the completed prototype.
(r) An aerial view of the prototype
Once the prototype is completed, you are free to experiment with other media. The above were make with cover weight paper. The prototype below was made with Duplex 110lb cardstock.
(l) Here is the detailed view of the duplex cardstock star book.
(r) An aerial view of the duplex cardstock star book.