Handling very large diagrams in Pages?

I am writing a book that requires sometimes the use of large diagrams. These are vector-based diagrams (PDF). Originally, I planned to use iBooks Author and widgets to let the user zoom/pan/scroll and use other nice interactive stuff, but after having tried everything I have decided to give up on iBooks Author and iBooks for now because of its dismal handling of images (pixels only, low resolution, limited size only, etc.).
I am planning to move my project over to Pages. Not having the 'interactive widget'  approach means I need some way to handle large images. I have been thinking about putting very large images in multiple times on different pages with different masks. Any other possible trick? Can I have documents with multiple page sizes? Do I need a trick like the one above or can an ePub book be zoomed/panned/scrolled, maybe using something different to read it than iBooks?

Peter, that was indeed what I expected. But it turns out iBooks Author can take PDF, but iBooks cannot and iBooks Author renders them to low resolution images (probably PNG) when compiling the .ibook form the .iba.
Even if you use PNG in the first place, the export function of iBooks Author (either to PDF or to iBook) create low resolution renders.
The iBooks format is more a web-based format. The problem lies not in what iBooks Author can handle, but in how it compiles these to the iBooks format. It uses the same export function for PDF, making also PDF export ugly and low-res.
iBooks Author has more drawbacks, for instance, if you have a picture and you change the image inside the picture, you can't. You have to teplace the entire picture. That process breaks all the links to the picture.
iBooks Author / iBooks is by far not mature.

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