Since calibre's ebook-viewer does not currently support fixed layout, I'd recommend looking at a different program to edit/view FLO epubs. In your case, I'd suggest biting the bullet and finishing the epub in InDesign despite it's learning curve. Dreamweaver can be used, sort of, to edit epubs if you don't mind unpacking and repacking, adding bits here and there to allow editing ncx and opf files, etc.
I've attached a snip of calibre's viewer and a commercial FLO epub.
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