My view of Writers.SE is that it's appropriate not only for writers but also for related professions - publishing including. So editing, agency, career-work are all on topic - and so's the nitty-gritty of self-publishing (or, heck, operating a small press).
Since this is a concrete, well-formed question addressing a field of concern to publishers of many stripes, I'd say it's firmly on topic.
My one concern is that if OP is speaking of making a single copy of the book (or just a few copies, for personal use/friends), then describing this as "publishing" or even "self-publishing" is borderline at best. But I think answers to this naturally scale to be useful at least to the level of modest print runs, so I'm good with this.