I'd be willing to take a stab at writing an article for at least one Celestial. If the audience doesn't think that my trial run is wretched or horrible and time allows for it in the future, I could possibly write others.
No one I think will stand in your way. Just say which you want to start with, so no one duplicates your work unnecessarily.
Do be mindful, you may not want to go first of the series, or you may want to do it at a time when you or another author is working on another in the series, because I feel it can be desirable to talk about the Celestial series in the proper context (see the recent article on the Cephalus, which puts it in the context of the Society forces very nicely). Now, that's a super high standard and no one will hold you to it, to be sure. But, if you really want to challenge yourself, then I think that's the challenge. I've done the series in the past, so I could lend a hand, or do one of the mechs you don't, if you would like.
As to next week, I'll take it with the Great Wyrm. After that, up in the air.