Looks really dangerous to me, can the UPS cardboard really prevent rain?
Yes, the distance from the top fans to outdoors is about 50cm, it would actually take gale force winds at the exact right direction for drops to actually reach the cardboard. Some would consider the whole cardboard unnecessary.
How come some H-cards appear to have custom heat sinks and some don't?
I have a batch of ~100 more heat sinks on route. This all I could muster up to this point, cleared out a finnish webstore and got one batch from dealextreme.