While visiting Salt Lake City, I was reminded of the role and value; that architectural models previously provided the design and construction teams of large facility projects.
The South Visitors Center of Temple Square in downtown Salt Lake City Utah; provides a scale model of the Salt Lake Temple.
The tour guide mentions that it took 40 years to build the Salt Lake Temple.
Scaled architectural models made of wood & plaster, full-size prints of iron work, stain-glass window patterns, staircase handrails & bannisters; are just a few design tools I've found when renovating historic & older buildings.
Sometimes, the designers realized they might not see the completed construction of their designs; on very large facility projects.
They went to great lengths to ensure their design intent was documented both dimensionally and visually. This enabled both current or future generations of designers and craftsman to complete in detail; their intended designs.
My tours around Salt Lake City revealed many of the city's oldest and newest facility design projects. You can take in many of the free or low cost architectural tours over the course of a Saturday and Sunday.