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I probably would have missed the capacitor orientation too, so it was a good catch. It's also helpful to know the circuit isn't particularly sensitive to using 220 µF versus 470 µF in that position, as long as the equivalent capacitance is in the expected range.

KiCad is a great choice now, especially for hobby projects. It has come a long way since this discussion started, and generating Gerbers for CNC work is pretty straightforward once you get familiar with the workflow.