On Saturday, the Joplin Globe ran an article about the Joplin Supply Company. The one time location where later on Ford Model Ts were built within and moved within the building by large elevators. That building is now one of the historic locales receiving the renovation treatment.
The article here.
Below is a photograph of one of the earlier locations for the company on Fourth Street. The parking lot adjacent to the former Federal building and located behind the library is all one will see if they attempt to hunt down this building today.
Source: Historic Joplin