I had planned on it in rear attached to fan, but too large, now it is outside. The PC-60plus is a compact mid-size case... I changed case from a larger one and added BW at last minute, and its a little difficult to read details compared to seeing parts in real life. But no biggie.
I am going to order a flowmeter and mount BigWaterSE on the inside top blowhole of my PC-60 case. Not definite, just thought of this a couple days ago, I haven't measured. All else fails, I will mount only radiator on top with fan in same location inside top panel, and drill two holes for the water lines into case from top panel, that way it would look flush mounted and really kind of cool. Either way, I am the type usually to take time in doing something right.