So how to build the lid with that profile and looking at the pictures. Thinking, thinking, and head scratching...:icon_scra
Kind of like a wood barrel sawed in half vertically and the staves would be used to make the lid? Coopered solid wood staves or maybe 1/4"- 3/8" bending plywood attached to a bending frame which becomes the lid of the chest?
The wood bending has to be in 2 perpendicular directions to get the "humpback" profile like an eggshell/2.