While the suggestion of dismembering a canoe for the bookshelf-trade can appear to be a sales tactic ("save this canoe before it's cut it in half!), it puts this notion "out there", for people to grab-onto as a possible money-maker.
If anyone wants really nice canoe-bookshelves, some of the current builders would be happy to put together a half-canoe with shelves, that wouldn't make anyone feel sad when they looked at it, because it never was a whole canoe.
I watch the auctions for expensive half-canoe bookcases, and they go off with no bids. I hope would-be canoe-dismemberers notice the same thing.
In a past discussion, someone brought up a point: if a family's treasured canoe was badly damaged, it might be nice to enjoy it as a bookcase in the home. That seems to be a different thing... more along the lines of salvaging, and re-purposing-- in a way that honors the history of the old canoe.
Kathy