Branson's North Carolina Business Directory for 1869 shows that Shelby, in the years immediately following the Civil War, had changed little from the rural county seat economy that it had been throughout the ante-bellum period.
Enterprise Architect provides a platform for the system engineer using the Systems Modeling Language (SysML) and model based development, and in addition to the engineering models the tool provides support for project and process management.
You might find it useful to look at SystemVision. It includes circuit-level modeling of magnetic elements. It's not for 3D field modeling, but it is very useful for modeling and simulating magnetic elements with electrical and electro-mechanical elements. It's a general purpose modeling and simulation environment. It's completely online and it's free.