The Foreign Legion's camp was right next to the church in Sangha Town. From the moment Joe Ga received the logistics contract from the Foreign Legion, the boss of the 'Giant Construction Company,' Old Zhu, brought his people over. It only took two days to set up the Foreign Legion barracks.
It wasn't a complicated task, just Old Zhu moving the container houses built for his laborers, lifting them with cranes according to the blueprint, and setting them in the right places where they hung suspended, and that was that.
These container houses were mass-customized by Old Zhu himself in China.
Not sure how much it cost, but one container house could sleep six people, equipped with solar panels on the roof and a water tank, covering the basic needs for electricity and washing water. The only slight hassle was dumping the sewage bucket daily.