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EPUB is a ZIP file (with specific assembly instructions)
Use Open with.. (your favorite ZIP program) to see the uncompressed sizes. Just don't modify the file.
Pictures files have their own size guidelines (there are only tags in the body)
Sigilsplt is Chapter Break (there is nothing to prevent splitting on other than a chapter boundary) and no rule that you need to split out by chapters (other than the size limitation in reader devices).
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