The lid separation went smoothly; mostly because the bottom was reasonably flat and sat square against the table saw fence. The only thing to clean up is the heavy burn marks on the lid side. The box side hasn’t got even a tiny mark. Why is that?
The inside looks better than I have expected: the miters are tight and the corners are pretty clean.
I have decided on butt hinges, the ones that have to be mortised into box and the lid; and, because the lid is heavy, a stop will be necessary.
-- "If you're not counting the ripples when throwing pebbles in the water, you're wasting your time."