Probable that you might want to publish different kinds of literal works? Need to manage writings and related illustrations, which are or will be part of writings? Already have a literal work ready and you would want to present the content differently?
In the KotvaWrite projects contain collections, which consist of different types of writings having particulars attached to them (e.g., photos). Particulars can be thought as components or parts, which reside in catalogs sorted to things. Writing collections are project-spesific, while catalogs are user-spesific and shareable between projects. In terms of book making writing collections can be thoughts as being parts of a book and individual writings would then be chapters.
Tech details are readily available for curious ones. Demo version is available by request.