^Deck plans for every deck were created and published in the Ent-D blueprints about 15 years ago.
The fact that so much has been published on the D is why this book is pointless, not why they can/should write another one. There is nothing of consequence left to publish on that ship. If this is because of the blue-ray releases, make something on the E, the other ship the TNG crew uses. This is my problem with the trek reference works we've had in recent years, lack of anything, new, compelling, or inspiring. Just a bunch of repakaging of the same old stuff or little bits left out of previously researched books because they are of little interest.