I am making an overflow box for my 125 and was wandering how low to set the internal box and how big the teeth should be, I was thinking 1\4" wide by 3/4" deep. Would this be sufficient enough to handle 1500 ghp? Th box measures 11 1/2" long by 2" wide by 6" deep with 2 1 1/2 bulkheads installed in the back of the box.