Hi,
I have years of experience working with eBooks. I am very expert in this type of conversion. I'd like to show you some of my past work if you are interested to look at.
Regards,
Shorab
https://www.freelancer.com/projects/Graphic-Design/Design-books/
https://www.freelancer.com/projects/Graphic-Design/Design-ebook-print-cover-for/
https://www.freelancer.com/projects/Graphic-Design-eBooks/Convert-INDD-file-MOBI-EPUB/
https://www.freelancer.com/projects/eBooks/ebook-Conversion-from-InDesign/
https://www.freelancer.com/projects/eBooks/Convert-docx-file-with-images/
https://www.freelancer.com/projects/eBooks/Convert-inDesign-EPUB/