Mounting the radiator was the main issue for this modification. I was considering putting it at the top of the case, but then I would have needed to relocate the power supply.
After some careful measuring, I noticed that the gap behind the 3.5" drives provided enough room. This also doubles in utility, (since the only fans this case will have are on the radiator) allowing the rad fans to cool the hard disk(s).
** The black marker line is where the motherboard will end when installed.