Well, the boards turned up and here are the results:
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The slots came out just fine (slight rotation on the holes across the batch - nothing to care about) and the connector fits perfectly.
Took their sweet time to arrive (I'm cheap, it's xmas time, no surprises), but excellently packaged and no complaints about their dirtiness! Even got an extra board. Will fly DirtyPCBs again.
Planning to put a board through shortly with a slightly awkward USB connector on it, looking for guidance on getting the slots made correctly.
Currently I'm calling the slots out on the milling layer, with an undersized hole in the centre, and extra copper added on the bottom layer. The slots are 0.8mm diameter (already oversized).
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Is this likely to come out right, or should I change to SMD pads and a bare 0.8mm drill hit in the centre of the slot? There are also two unplated slots to the board edge, I'm unsure if those will come out right either.
