And from the peanut-gallery, if the Gerbers are still pending, how about a hole to make a strain-relief loop for the battery holder wires. I'm not clear if you're advocating the 2-pin male-female connector (looks non-polarized which is iffy IMO) as the on-off mechanism. But if running the red-black battery connector wires soldered right to the pads (no connectors), looping the wires thru a hole is a cheap "free" strain-relief to prevent the wires from breaking at the solder joints.
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