The continous fins allow more heat to travel up from the baseplate, which give the coolant a chance to take it away easier, because without fins, it just couldn't keep up with the concentrated heat coming from a flat baseplate.
The #rotor block and variations work well, but their main advantage is that they are far, far easier to build than anything else. They will never beat straight continous fins, but they will always come very close.
The design you are proposing involved the use of a CNC machine, and if you have that (or access to one), you ought to get passed the #rotor block design. I think you're almost there.
Maybe you want to take a look at Cathar's design thread, in the OCAU forums. You can also take a look at my block right here: Radius.
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