Design Principles Publication 1.2

After researching into publications and seeing how they can be made, I have realised the possibilities a simple book has. 

In order to improve my design decisions, I am interested to see what size of book is relevant for different genres of publications:

Books

B Format 
Medium sized paperback
198mmmx130mm
Cheap, small, literary novels for different genres

Novels/Memoirs
A4 portrait

Childrens Book
Flexible
178mmx124mm
200x200
250 x 200
Tend to be larger for kids as its visual

Common Paper sizes:

A4 - 297x210

Letter - 279.4 x 215.9

Legal - 355.6 x 215.6

From my previous research, I looked into different way books can be made. Books within books and different sized pages allowed a other elements to be visible. This opens opportunity to play with visual qualities such as colour and shape.

Researched into folds to increase my knowledge and practice of paper folding for publications:

Folds

Spent some time practicing these folds in order to create a publication:

3-Panel Gate Fold

Simple fold that require the two sides to be folded into the middle.

As a result there are 4 narrow section and one large section. I thought I could take advantage of the small sections and use one as a window to suggest information below.

Noticed I should have cut a smaller window as the paper is very filmsy. I would need to use a thicker paper/card to use a large window. 

Quickly hand rendered the type to get an idea of how I could add the title of the fold. 

Typography takes up majority of space on the largest section which means less room for informative instructions for how to make the fold.

Searched Pintrest for more editorial inspiration and paper folds:

Books don't have to be confined to just one size of page/cover. Cut into pages/change size of page to change subject matter or add visual cue - reduces the size of type. 
A book within a book