Some types of exterior sheathing, such as asphalt-impregnated fibreboard, plywood, oriented strand board and waferboard, will provide adequate bracing to resist lateral loads and keep the wall square.
This guitar had a slightly longer scale length than a standard guitar, slotted tuners, ladder bracing, and a trapeze-style tailpiece to resist bridge lifting.
It no doubt will stir controversy, especially in a frothy summer entertainment, but there's something bracing about the film's saucy political incorrectness.