Looks good to me. Could be done with 3 plates.
Bottom plate with the drilled dimples.
Middle plate with the jet array and exit arrangement, and an O-ring groove to seal to the bottom plate.
Top plate that's hollowed out with an inner and outer O-ring. Inner O-ring seals the inlet which leads to the jet area. Outer O-ring seals the block and the outlet area which could be a single outlet barb.
Sounds to me like an excellent idea. Often been pondering how to get an effective arrangement of jets over the core area. You could even have little cut-out inserts which fit into the upper jet arrangement cavity below the inlet to alter the jet array to suit particular die sizes, or have the insert have the jet holes drilled into it itself of varying sizes focussing flow at various sections of the block as required (and determined via a thermal spread analysis of the block for a particular CPU die).
"Dimples" could be as little as a 2mm deep indent of 2mm in diameter. Probably better to arrange them in a honeycomb fashion rather than a grid.
The whole basic block could be completely customisable.
I like it.
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