[Jabo]

Looks great, very nice models Jackal!
I'd suggest placing inlet over VPU finned area and split coolant into two streams for mem modules. Look at jaydee116s block and imagine central inlet and two side outlets. In your case no outlets but channels over mem modules and to the other side.
The most beneficial way of cooling a vid card is to cool its VPU, passive copper heat sinks are more than nuff for all but extreme volt modded specimens (some peeps totally denounce mem chips cooling as counterproductive)