Polivka GmbH, I really like your idea of using shipping containers as data centers.
I wonder why you have chosen to pull and push air through the floor? I guess that you preferred water tightness over efficiency of the air movement & cooling. One could design an intake from the bottom of one side, then an air velocity through the miners and then an exhaust on the top of the other side. This design would be much better for hotter days. Rain could be managed with deflectors for intake and gravity flaps on exhaust fans for the other side.
Did you experienced troubles with water being sucked in or with leakage?
No water sucked in - snow would be more prone to any ways, but also isn't a problem as long as you have filters.
This design also allows to integrate silencers, which you often need - depending on the place you put the container.