all I would do is buy 2 lumps of Aluminium from a local hardware shop, 1" x 1" x 3".
Drill a 1/2" hole down it's centre line, then drill a series of holes across it.
I'd drill the cpu one as 1/2", while the rest at 3/8", remember that your cpu is by far the most important, so you want the max possible flow to it.
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