Yes, the guys that made the video and website had attached an external radiator to cool the entire system. They had reached up to 88C in their benchmark testing (12hrs worth). But said under normal operating, it stays within reason. They removed the radiator after a few weeks, and have been operational since then without problems.

I do have a Thermaltake Bigwater system that isn't being used. I could submerge the pump in the oil, and run it to the radiator/fan outside the tank for cooling.
This would help the summertime temps in the computer room stay under 1bajillion degrees (i hope)