Another aspect of Underhill:
He is about the only author who focused on iron, steel, and composite sail between ~1860 to ~ 1914. His plans library at Brown, Son and Ferguson has more than a few plans for vessels of this era.
I have not visited recently but I remember The Mariner's Museum - Newportnews VA - had on display builders' or shipping company models of numerous steel vessels from the same era as Underhill's. Some were very strange - failed experiments and starting points that were later evolved to more standard designs. I have never seen a book covering this and I am not sure about any plans - given that these were engineered vessels they probably exist in various libraries and archives. It seems to be a wide open field for an enterprising author. An author will to produce a book with an almost zero audience. Sounds like just the thing for a TAMU grad student who is will to do way more than necessary for a thesis or dissertation.
For a while Model Shipwright provided plans for some of these strange and obscure vessels. Simplified to the basics -