Randal.
I hope this is what you are after??
Many local museums hold plans of various ships built in their area, but the
one that holds by far the most is the National Maritime Museum at Greenwich.
There is a note about this source together with the contact details etc in
the files section. It comes just after a file on Mount Washington and PJs
Director System.
Just a note of caution, they can be quite expensive, as they charge a search
fee as well as the printing and packing charges. Details in the file note.
I don't know why it is so wiiiiiiiide!!!! It wasn't when I posted it.
Good luck.

David