I've cut the miters now. With the board being out of square somewhat and my lack of specialized tooling, I was forced to cut the miters on the bandsaw and clean them up with a chisel. Given that I have never done it, three of the four corners turned out well enough. The fourth, unfortunately, is a train wreck. I can disguise it at the cost of Yet More Time. Looking back, of course, it is very easy to say, if I spent half as much time being careful as fixing st00pid mistakes, I'd be done...
Oh well, I'm getting smarter by the minute... So enough with the whining, here we go.
Here's the board with the borders. All mitered. Now you can see the accent strip very well.
Here's the best corner.
And here's a closeup. The camera angle is being kind to me. There's a black line there though I expect it will fill in with sawdust. Hey, I'd prefer a perfect miter, but I'll take it where I can get it!
Finally, here's a motivational picture I took for myself. This is a set I received today. I bought it for this board. It's a decent boxwood and ebonized boxwood set with a 3 7/8" king.
Yeah, I cropped it to be a tease. ;-)
The next step is to repair the bad miter and glue the borders on. Then I'll re-evaluate the situation. Optionally, before the gluing, I may put a decorative arc in the borders so they don't look so heavy.