In the afternoon after assembling our new wheelbarrow, I hauled it from the truck and dumped it in the sand box. Success!
We were having some friends over for dinner that night, but before they arrived, Sprout was out playing and digging. After dinner my son, our friends two kids, and the neighbours daughter and her friend were all in the sandbox diggin and playing.
It was a glorious sight! All my worrying about a less than perfect sandbox flew away.
Here is the final construction pictures.