Did a quick glue up after transferring some measurements. And then cleaned it up a bit to get it more or less square but not final dimensions.
Cut it down to the final shape and did 1/4" round over on all sides. At first tried to cut the box in half using my coping saw since it was the thinnest kerf blade in my shop, but it didn't go 100% and I had to clean it up on the table saw, which removed too much material and the "slash" didn't line up anymore. So, instead of making it a slash I rotated the bottom and made it a "chevron" instead. The zig-zag made it a little less obvious that it wasn't perfect.
Still needed to fix some small gaps.
Did a quick test of making a template and using the router to hollow out the inside of the box, worked pretty well.
Moved on to the actual box and it was going great, shallow pass, shallow pass, shallow pass. Then the router skipped and slammed in to the wall
Took out half a side in one big chunk and half of the back wall. I 100% know what I did wrong and can only attribute it to being too comfortable and not familiar enough with the small things that can go wrong. Was pretty crushing seeing all broken.
Walked away for a while, went to my FFL and picked up an HK SP5 to make myself feel better. Came back this afternoon and figured I'd take a shot at repairing it. So I glued the large corner piece back in since it was mostly whole. Chiseled out the back wall to make a repairable patch area. Cut a walnut piece from the original larger block, and have it glued in and clamped. Tomorrow I'll try to finish the hollowing and take some more time. Still have the top to do as well.