Not entirely sure why they've got into building, but they emphasise the sustainability of their construction technique. The owner likes to show off going by his private jet, the fact he built a palace in the style of Versailles, and the 130 foot pyramid on the company campus, picture in the impressive article below.
Maybe thats the most efficient amount without getting in each others way, the faster they complete this structure the faster they can move to the next. I'd assume over there they don't have many problems staffing a 24/7 worksite.
