Ok, I am trying a software called Designrr. What they do is a tool that helps you to compose one or many blogposts into an ebook in a very simple way. I just did a very small test and collected a few of my latests posts related to the term "design thinking".
The ebook comes out in the form of a PDF. I have not put any effort really into layout or even fixing any language issues. I just wanted to see if it worked and I think it did. I might look more into this as a way of collecting and composing shorter writings into something longer and more substantial.
Here you can download the pdf.