So the casting came out pretty flat. But taking it to machine flat is (as expected) a lot of work.
Next time I'll make the cores a 1/2 mm too short. I think they were slightly too long and pushed up the center of the sand a fraction.
I've been working so far with a wood rasp, then a coarse diamond stone to remove burrs. I tried a woodplane, but it didn't really work very well.
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