The modular, factory-produced nature of the construction here makes a given level of quality a lot faster and cheaper. They can automate production of things th

The modular, factory-produced nature of the construction here makes a given level of quality a lot faster and cheaper. They can automate production of things that ordinarily would need to be constructed on site, they can do easier quality control, and they can devote more engineering effort to modules that get used many times. (Note that this only applies to the parts that they can actually factory-build. For example, it doesn't apply to the concrete work for the foundations.)