I got those photos off a Facebook page....I went back and here is some more info that they have in the thread..
The Facebook page is "Scale Cadillac" if you have Facebook you should be able to search it. I think someone also posted to the AACA Facebook page so you could start there and make your way back to the source.
𝗪𝗵𝗼 𝗺𝗮𝗱𝗲 𝘁𝗵𝗲 𝗳𝗶𝗿𝘀𝘁 𝗰𝗹𝗼𝘀𝗲𝗱 𝗯𝗼𝗱𝘆 𝗳𝗼𝗿 𝗖𝗮𝗱𝗶𝗹𝗹𝗮𝗰?
Хто виготовив перший закритий кузов для Cadillac?
At the end of 1905, Cadillac presented its founder Henry Leland the first completely enclosed car in the company's history. The small single-cylinder coupe was liked by 62-year-old Henry, who drove it for many years — even after Cadillac began producing 4- and 8-cylinder cars.
Where did this body come from? And here begins a real detective story.
According to the first version, the authorship is attributed to the Detroit firm Sievers & Erdman. This is written in the reference site of automotive coachbuilding (link left in the comments) and several publications that refer to Cadillac information (for example, «80 years of Cadillac La Salle», Walter M. McCall).
And more! The Sievers & Erdman own history states that it «supplied most of Cadillac’s closed bodies prior to 1910; initially wood paneled, they were supplanted with metal body panels, first of aluminum, then steel».
Everything is clear, isn't it? But acclaimed Cadillac historian Maurice D. Hendry cites a different version. Here is what he writes in the book «Cadillac, standard of the world»: «The body was built under the supervision of Fred J. Fisher in the Wilson Body Company plant in Detroit (who became later the founder of a company that for many years created bodies for Cadillac. - Aut.)».
And the most interesting thing is that this information is confirmed by the same reference site that gives the authorship of the body Sievers & Erdman (link in the comment)!
So whose hands actually created the iconic car? If you know the answer, please write it in the comments.