The top block is just a block that is drilled through. The top can be threaded for use with a nipple.
The bottom block is a pressed central cylinder ... the trick is retaining the center cone (if you wish, as other people said, it may not be necessary, but I feel that it may guarantee maximum cold water contact due to increased surface area. You be the judge). The two side exits are drilled and threaded for nipple use (straight would be best, but I think elbows should cause the flow pattern to remain the same inside the block, though you'll get lower rotational force, methinks). The bottom block is also channeled for use of a O-ring. This can be bored to be connected together by hex nuts, the bottom block can also be extended for direct mounting by use of the motherboard holes.
I'm going to try to shut up now ....
edit: I can't spell today.
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