Well done. I kinda remember this from back when from the WoodSmith POV, so I searched images for "Curved lid treasure box" I was surprised just to see your box, and WoodSmiths. I thought many of them would pop up. So it looks like nobody else posted what they built, or you were the only one to accept the challenge. The page from WoodSmith gives some additional info, and a short video that explains many of the possible sticking points. Nice build, and well done.

WoodSmith Curved Lid Treasure Box link