Hmm...
I have one version with 1/2" inlet right on core and 3/8" outlet on both sides.
And yes, CPU block would act as the splitter in that design.
Some good news! I can get the blocks milled relatively cheaply in local vocational (sp?) school! Smallest mill bit they have is 1mm so I can add some complex designs in my blocks.
Total cost should stay well under 150 euros. (Hmm, why cant I use euro sign. It shows up as a question mark?)
Vocational schools here in Finland are known to do quality work and can do just about any task one can throw at them.
Oh btw, I might change to metric system so dont wonder.
Im considering adding somekind of fins or a diamond pin matrix as in Swiftec blocks.
Ill post a render or two in couple hours.