I’m so sorry you had to go there. I went there a few years back when a customer was inadvertently sold on the idea of doing an iBook just like Yellow Submarine, which was pushed as the “look at all the wonderful things you can do with iBooks” solution.
Unless you had a 1st edition iPad. Or a 2nd edition iPad with less than 64GB. And you didn’t use Apple’s iBooks JS framework (which was under lock and key at that point in time).
Good people shouldn’t have to repeat other people’s disastrous experiments.