Interesting, the mod is actually for a mini-itx system.
I am trying to make it passive (it't one of the ones with a fan).
Basically, I have managed to succesfully fit a zalman northbridge fan (ZM-NB47J) and it works ok, but it under full load I am getting ~60*C and thats outside of the case.
It doesn't use screws, it uses these wierd spring thingys.....
Also there is a height limit because of the case....i'd say the max height is 75mm.