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Is there a problem with that? The water goes in through either end, doesn't matter, and most of it is supposed to be routed through the middle, but I tried to have a design that would create some turbulence as it went around the top and bottom and all 3 channels would meet up at the outlet.
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Not necessarily a problem, just not an optimized design. The heat won't really spread out very far from the center of the CPU die. Thus the pins on the outside edges will be useless. By replacing the areas where you have pins, in your original design, with solid Cu, you will increase the velocity of the water over the die area. This will result in better temps. The second design will be too restrictive and will not create much turbulance. Take a look at the first block #rotor made or JD's lummpy channel, for examples of highly effective, easy to make blocks. I believe both can be made with as little as a drill press, though you obviously have access to CNC mahinery.