For the triumph flare box, I would need the length and width of Bbd and thickness of bed planks. Height of side walls, first verticle, flare, and second verticle as well as overall height of box. Finally need the width of ends at the bottom and top.
For the general purpose, I would need the length and width of Bed and thickness of planks. Height of side walls and width of end at the bottom and top.
I can send diagrams if that would help.