the cooler is just in there, there is nothing to mod for that.
Here is mine, I added the cover to the floor, but the hatch was there when I got th boat, is that what you are talking about??
I have a tool box and a safty box in there, there was a toliet when I got the boat, but I removed it.
That hole now holds my lunch cooler and all the trash we guys make thur out the day.