A lot of really helpful and thoughtful comments and very much appreciated.
Will consider it all—especially the footnote decision tree.
The way I used footnotes, they are not references, they are in effect, parenthetical info that could very well be made a part of the book and I will need to think on whether or not that is the best route.
I like the single page footnote approach that Calibre renders as it aids the reader in focusing on the one footnote I want them to focus on when they click a footnote number and two, it makes abundantly clear how to "go back."
But, I don't want to get banned! So, maybe need to change that.
As to Kindle Create, I have found it to be a buggy mess (which is why I ended up using Calibre).
I have lots of hyperlinks in my book (to videos and resources on web) and though I "preserved" links in KC, many of them never did work despite numerous interchanges with Kindle Support.
Support were able to duplicate my problems on their end and kicked it up to their software engineers to resolve. Still have not heard back.
BTW, I'm running a Mac Mini on the latest Mac OS (10.14.1).
Again my thanks.
For any that want to see the finished product, its
available for free right now in a one-week promotional free giveaway. The version you will see still has some formatting problems (mostly involving tables) that I have since fixed, but I am waiting for the promotion to be over before I upload another "cleaned up" version to KDP.