I was once interested in publishing a SF anthology. Formatting and editing was nbd -- I was going to use Amazon's KDP software package for most of it, which can take a .docx and output an ebook in 5 minutes. I've done it before for non-anthology books I've published, and it couldn't be easier, though I understand why people might avoid Amazon in this day and age.
The real trouble was getting the rights to all of the different stories! Though everybody I was able to get in touch with was great -- in particular, Peter Watts, Alan Dean Foster, David Moles, and Walter Jon Williams -- many authors were totally impossible to reach! I ended up scrapping the idea after a few stories I was intent on collecting in the anthology were unobtainable. (And this after I had already paid an initial sum to many of the authors.) Finding alternates and embarking on more contract negotiations just seemed like too much work.
Anyway, I bought your anthology, will review when I'm done reading, and sincerely respect the hard work that went into it!