A small update.
The hydraulic equivalent to a 1 by 3.25 mm rectangular opening is: 1.53 mm (diameter). The closest imperial measurement is 1/16. There are, of course, 4 of these.
Now I can drill 4 * 1/16 holes in a PVC cap, and run a flow test, but off-hand, it's gonna be awfully small.
In the meantime, here's a render of the latest revision of the top (thanks again to Utabintarbo).
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