HX CONCEPT PROVIDES VISION OF A RUGGED, OPEN-AIR HUMMER * Youthful, open-air entry-level-size HUMMER * Designed by a trio of young designers * Convertible body with removable roof panels and modular rear roof assembly * Easily removable fender flares and doors * Full-time 4WD with front and rear locking differentials * Aeronautically inspired interior with functional, lightweight design elements * Reconfigurable instruments for…