Kahn
Learning the terminology can be like learning a foreign language at times.
The following is from the dictionary portion Steel's
The Elements and Practice of Naval Architecture. The spirketting and quickwork scantlings for various size ships and for each deck can be found in the Establishments, as well as the folios in
The Elements and Practice of Naval Architecture. Both sets can be found in
Scantlings of Royal Navy Ships.
From Steel
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Note that it extends to the lower sills which are the lower cross pieces that makes up the gunports.
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The picture below is from Peter Goodwin's
The Construction and Fitting of the English Man of War, page 44
The quickwork is the thinner planking above the spirketting.
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I hope this is useful to you.
Allan