Quickbuild's are something the JWs crow about a lot as evidence of Yahweh's "spirit" working on them, But amongst the puffery' there was a solid fact that the buildings were often the result of good planning rather than divine assistance.
And, in most cases the buildings were seldom built in a weekend. They couldn't be! A concrete slab foundation needed time to dry out before walls could be built. And before the slab could be poured, the ground had to be levelled and services like plumbing and drainage roughed in. And double brick walls could not be built to full height in one day, and even gyprock plasterboard could not be installed and painted all on the last day.
So a lot of puffery, but yes! taking a step back, the witnesses usually managed the process quite well.
So I don't know what God is "blessing" this building:
But, I hear if Yahweh and Jesus want to know how to improve, Buddha and Kongzi (Confucius) are willing to teach them.
P.S. It's also NOT true to say the building was "built" in 19 days. All buildings need planning and "management" AND in the Chinese example, so much construction activity was performed off-site in the factory, so the pre-built segments were just fitted into place and secured.
Still it's impressive.