Lift-out insert pad with ribbon pulls

A lift-out insert pad with ribbon pulls: a pad of board laid in a case or a gift box over what it holds, its edges creased to fold up as short walls, with a ribbon pull near each end (a loop of ribbon through a slot) to lift it out by. The edges fold up on the two long sides only, or on all four, with the corners cut away so each edge folds on its own. The pulls are accessories: bought in (or cut from a reel), shown in 3D standing up from the pad and costed by the Accessories and fitments report from the price list; their slots are cut with the pad. Sizes are the inside sizes of the case it goes in (L × W) and the edges' height (D). The board's thickness (T, chosen as the material) is allowed for: the pad is 2T smaller each way than the case (T to drop in, and the raised edges' board), and the corner cut-outs are T wider than the edges, to clear them as they fold.