No matter what, the motto still stands: if it seems too good to be true, it probably is.
Personally, I would have picked the one size hole that I want to make this cross-drilled block with, and purchase that one bit, instead of a set of 115 of them, at various sizes. But hey, that's just me...
Good luck with your project. For what it's worth, in XJinn's design, the bottom two rows of holes do most of the cooling. The above rows #3, 4 and 5 add very little cooling. Personally, I'd stick with two rows.
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