Bolt-throughs with metal bolts might well damage the radiator, but how about bolt-through using threaded nylon rod stock like procooling used in their review of the blackice??:
I should think nylon would be soft enough to avoid scraping the radiator tubing??
Threaded nylon rod stock is easy to find, for example:
Mcmaster.
Maybe HWlabs could discourage use of metal bolts by supplying a few pieces of threaded nylon rod long enough to go through the radiator and a fan and some nylon nuts with the Blackice radiator?
As for where to mount it in my case - the case picture I posted in my original posting doesn't show the lower front 120mm intake fan mount clearly - admittedly either of the two rear 120mm fan mounts would be a tight fit for the blackice radiator, however I had thought of mounting the Blackice on the lower-front 120mm intake hole, (which has lots of clearance around it), with a fan mounted inside the radiator to suck intake air through it. Using nylon rod stock to bolt-through mount it that would be:
nut:fan:radiator:case:nut
<<<--airflow--<<<
This would warm the case intake air slightly passing through the radiator, but since that case has oodles of exhaust, it wouldn't hang around long.