Additionally, is there anything specific that anyone is interested in? Especially things that I've not mentioned.
By specific, I mean something that can be addressed in a relatively brief article. On openings, about the most I envision in a single article is a brief survey, giving the ideas and a few of the main lines. Then perhaps additional articles devoted to specific lines. E.g. the Ruy Lopez is a vast topic. Even a discussion of a Closed Chigorin Ruy Lopez has the potential to get tediously lengthy. I've been studying the Ruy Lopez for close to 40 years and feel I've barely scratched the surface...