I am embarking on a project that is technical and difficult -- trying to build a desk inspired by Abraham
Roentgen and his son David. The Roentgens' designs were combined with mechanical devices that revolutionized furniture making then and it is still somewhat of a mystery how they were able to accomplish it before the age of technology that we live in now. The link to one such piece is below:

http://www.metmuseum.org/exhibitions/listings/2013/roentgen-furniture

If you have any leads on places where I could get information, architectural renderings, mechanical blueprints, etc, I would really appreciate it.

Thanks!