almost every commercial building is made this way with flat slabs made elsewhere and bolted to steel frames on site. they go up in hours after the frames are up. My example was Habitat 67, built as concrete forms that we later assembled on site 10 or 12 stories high were built this way. they are still luxury condos today. They were put together in such a way that every unit had a balcony and a view most were around 1000sq feet. I was expensive to do in the '60s but if you were 3d printing in concrete or some flowable material it could work. even if you had to set up a portable sort of concrete plant to turn these out nearby it could work.