You also mentioned that you have the electrical covered by one of your colleagues so thats not a problem.
My recommendations is managing the temperature, moisture and airflow. Do some research on how data centers manage these parameters.
Once you've mastered that, you'll be fine.
Its one thing to manage 5 to 10 asic miners, but 50? You'd definitely have to go data center style.
I'm from a tropical country as well - St. Lucia in the Caribbean. I currently have three asic miners and plan on increasing those numbers over the next couple of months, and thats exactly how i plan to. I am also going to be incorporating Solar energy as well.
Helping the electricity consumption with Solar Energy? wow that would be an interesting installation for you to share in its own post.
Basically because I guess you will have to install a well designed battery bank and use optimal performance cables.. .anyway.. hope you can tell us how it goes!
good luck mate