Let's see...
Let's assume that you're basically setting up a 90 deg elbow here, for practical purposes. What kind of pump do you plan to use? What kind of flow rate do you expect to achieve, or are targeting?
I'd follow up on airspirit's idea by sizing the little extension specifically for the flow rate that you're shooting for. What pump did you have in mind?
Of course your baseplate thickness should be optimized for that flow rate. Where on earth did you get that odd copper piece?
In another thread, I advanced the idea of having perfect rows of square pyramids (for another purpose though). I think you might want to try it, instead of the "drill bit circle": just use a file (if you don't have the power tools).
Are you going to braze the whole thing together?
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