here is some thing i quickley put together today.
take the thermaltake copper skived base and remove the fins until they cover the top of the p4.
lower the fins down to 5mm
make a base plate to the height of the fins.
make a middle plate with a jet design to spray the incomming water over the full width of the fins.
made this clear for the example so you can see the shape.
this would be round on one side and oval on the other.
put a top on it.