Hmm...
An option given the long and short sets of screws is:
Screw(L)|Fan|Rad|Case|Screw(S)
That way you wouldn't have to trouble yourself piercing through the fins.
Yeah I do agree, given the clearance between the exhaust fan mounts I don't think having the Black Ice in the exhaust, unless you wouldn't mind losing another fan, would be feasible.
But having 2 120mm exhausts and 1 120mm intake may give you negative case pressure. Is there another intake that I haven't seen?
Likewise is there anything else you'd be mounting at the end of those screws? That pic was that of the prototype and Chip over at OCWC was playing with mounting options before sending it over to Joe for a review.
However, it should be no problem for you to get the Black Ice with nylon screws. Order yours from
www.overclok-watercool.com and simply specify nylon screws.