Our PCB designers will layout PCBs with parts rubber-banded from the schematic, and get "skins" of the components from many of the parts suppliers. The "skins" are 3D files that depict the shape of the parts. The process for complete PCB design is to layout the 2-D PCB, which is then ported into SolidWorks where the "skins" for critical components are added. By using SolidWorks or other 3-D mechanical design tools, the designer can get a complete 3-D view of the assembly that can be placed directly into the housing or upper level package to ensure a complete fit. This is critical because connectors, LEDs, switches and sensors are often mounted directly on the PCB. This method greatly increases the chances of first-time success with the right mechanical fit.