Well, this is really dragging on. If I would quit making mistakes I'd be done!
Anyway, I cut the miters pretty much by eye on the bandsaw and cleaned them up with a chisel. This is something a skilled craftsman can do with ease. Which is to say, I made a mess of it.
So I give you, ladies and gentlemen, BRUTALCAM (tm) ... Here are closeups of the patched/repaired miters. To see this yourself you'd have to push your eyeball up against the board - so it isn't quite as bad in person.
Obviously the one in the upper right is rough. When making the cut on the bandsaw, I cut on the wrong side of the line. Pretty serious when 1/64th of an inch in unacceptable! But as it was the 2nd miter cut on that piece, and as I cut it too short, there was nothing to be done except to deal with it and try to do better next time. The dark spot is actually glue, so this will probably look a little better (a little less bad?) after some finish sanding. I'm as pleased as punch with the other corners.
Here's the board again, this time with it's first sanding. Tomorrow I have specific rough areas to sand. Then it will time for the final sanding and the finish.
And once again, the board with the new pieces on it. Why? Because I can!