Ha Ha Ha Hee Hee Hee!
That much cooling is like Wow!
I don't think you will ever have a problem with the cooling.
Put thermostats or small thermistors or PTC from somewhere.
The cheapest will from an ordinary clothes iron, you can adjust the temperature.
You can try a push pull fan system, one pushing and one pulling the air.
Also, put AC fans, DC are less reliable.
That much cooling is like Wow!
I don't think you will ever have a problem with the cooling.
Put thermostats or small thermistors or PTC from somewhere.
The cheapest will from an ordinary clothes iron, you can adjust the temperature.
You can try a push pull fan system, one pushing and one pulling the air.
Also, put AC fans, DC are less reliable.