that is a good idea for practical purposes. but you should consider that the water flowing through the top mirrored half is almost not taking heat away from the copper; transporting ok, but not taking away. so; lets say u have a 0.8" diameter circle around inlet with small thickness baseplate, no drillings in top half. the water would be forced to take away only heat from lower half. outside that radius u could do anything in your power to increase flow.
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