The Handbook plan view also appears in the Conqueror Profile #38. I've scanned the drawing and placed a bounding box around the turret as you see below.
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Next, I took an overhead photo of my completed Black Label Conqueror turret and added some transparency to it so the drawing would be still visible. I layered it over the drawing, scaling it to fit the turret width. Lastly, I lined up the front edges of the external mantlet in both photo and drawing, and this is the result.
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As you can see, it doesn't line up very well. Next, I nudged the transparency forward bit by bit and here's what we have now.
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The turret shape and features are very close to the plan view drawing with the two issues I see being that it seems just a bit short in the bustle and missing a bit of curvature on the right side. Of course, the major issue would be in the mantlet IF THE PLAN VIEW DRAWING IS ACCURATE. We have no means of determining if it is. The Black Label turret sure seems to look more accurate than the Accurate Armour turret to my eye though.
Cheers,
Chris