This should have took considerable time for designing and manufacturing the modular parts taking into account not only the final state of the building but also

This should have took considerable time for designing and manufacturing the modular parts taking into account not only the final state of the building but also hundreds of construction stages. The parts should have been manufactured and factory assembled with extreme detailing and with very low tolerances so that the final on-site assembly required as little work as possible. Also, the logistics should have been planned with excruciating detail and with more workers and site equipment than normally required. I think the total time from design to construction took many months or even more than a year and it cost more than conventional construction. Not that I mean to undermine the effort; this is a marvelous feat of engineering and logistics.