A laser processing unit includes a workpiece loading station. A laser workstation includes a laser robot operable to perform a laser operation on a workpiece. A track extends from the loading station through the workstation. A first stationary wall section separates the workstation from the loading station at a proximal side of the workstation. A second stationary wall section is offset from the first stationary wall section at a distal side. A first movable wall section forms a laser light-tight seal with the first stationary wall section. A second movable wall section forms a laser light-tight seal with the second stationary wall section. A shuttle is operable to move along the track to deliver the workpiece from the loading station to the workstation. The movable wall sections are supported by the shuttle and move concurrently with the shuttle and the workpiece, as the workpiece is delivered to the workstation.