Speaking as a resident, lurking PrePress fellow -
I would say - that your plan is just fine.
I can tell you, though, that some (many) PrePress guys
would just take your individual pages and
copy and paste them into a new document the final size (even if they
do not know the spine width at the time)
rather than exporting as spreads. So ... as usual, check your proofs
carefully.
As for me ... I would just as soon get the text pages in that one file
as well.

MSD

-----
On May 25, 2010, at 2:55 AM, InDesign Talk wrote:

> Has anyone prepared a file in CS5 with multiple page sizes and sent
> it > to a commercial printer? Something like a book cover with the front, > back, and spine, or a brochure with a short fold?
>
> I'm thinking right now about preparing a book cover with a separate > spine so the printer can adjust the width a few points based on the > actual bulk of the paper.


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