Okay, so I haven't tried the above workflow with a more complicated book. The books I produce are all levels of complication. From simple, straightforward novels with chapters, to full color coffee table books with non-standard page designs. As examples, here are 2 books I designed -- first the straightforward novel at:
www.patriotsreward.com, and the much more complicated baseball card collector's book:
www.t206players.com. Each page in the T206 book was its own design. Each block of text is a separate story - none of it is connected. Each baseball card image is placed separately and rotated into position manually in InDesign. The authors have asked how much it would be to turn it into an epub, and so far, I don't have an answer for that. I think that book would have to be a PDF. I'm not even sure it is affordable money-wise to turn that book into an epub.
(I also did the Website designs for both of the above mentioned books.)
So these are 2 examples, and then there's everything in between. There are things you can do when designing print books that will make the conversion from InDesign to epub easier, and these are noted in Liz Castro's book. But I didn't know I would be converting books printed before 2011 into epubs, so the older InDesign files I have take more prep time for conversion.
Next up, I will describe the process I've used 3 times now, to export from InDesign to .mobi.
I will just add a note here that I have tried using Calibre and not found it to be very helpful, and the .mobi's it creates from epub so far don't validate for Kindle. I have lots of software tools, including BBEdit, Dreamweaver, Springy, Sigil, Kindle Previewer, KindleGen, and epubcheck. So between all of these, I've been able to solve the warnings and errors noted in the validation process.
Happy ebooking!