Wow...self gratify much? Bitter......Party of one...This way please......
As far as your NB block, it looks OK. I would introduce as many pins as possible since that's the way that you seem to be wanting to go. ( I.e. shave down the Swiftech MCX462, or soemthing similar. You get my mental image.)
As far as the rest of your setup, go rad --> CPU --> pump. It's better that way. As far as the homemade block.......it takes only trial and error...........retail blocks are PRE-tested
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