I have been trying to teach myself to code and to make eBooks, so I certainly have some interest in the topic.
In fact, after figuring out how to manually make ePubs, the next step in my plan is basically to learn how to code by writing some scripts to automate as much of the ePub creation process as possible.
What I've found from doing a fair amount of research over the past month is that there is no shortage of information available online, but it is hard to gauge the quality of it, and much of the 'good stuff' is technical and requires some background knowledge/vocabulary that beginners lack.
It would certainly be helpful to people to have a guide to sort out the good from the bad and the ugly as far as online resources go. Whether or not your book would have commercial appeal would depend on how interesting/well written it is.
On the other hand, publishing your own eBook doesn't have to cost you much, so if you think you would enjoy the process and having written the book, go for it.
My background is publishing, fwiw.