I also love this book and I also struggled with how to make this structure. I found your post by googling. Thanks for being there. Your explanation got me to the final product but I still have no idea how you got from the flat page to the picture with the heading "Before this final step . . .". I ended up using the picture after "you need to reverse all the folds ..." to fold the little folds and then matched your A's, B's etc.
I also love this book and I also struggled with how to make this structure. I found your post by googling. Thanks for being there. Your explanation got me to the final product but I still have no idea how you got from the flat page to the picture with the heading "Before this final step . . .". I ended up using the picture after "you need to reverse all the folds ..." to fold the little folds and then matched your A's, B's etc.
I love your diagram to help aid Alisa's diagram! What a fun book!