Actually, I think it's pretty comical. I asked a while back at another forum if anyone had enclosed an SK6 with a water jacket. Someone actually had, but not in the manner I would have preferred. As noted, you would want flow moving parallel with the fins and this design didn't really address that.
Because of the differences between air and water, the fins of such a block for water use should be comparatively shorter and thicker than for use with water. It still comes back to balancing flow loss and velocity, conduction through the metal, surface area for the water, etc., etc.
Reference
here.