Not ideal but you can do a detail view over top of your base view (drag base view off sheet to avoid printing). In the detail dialogue box, select the rectangular fence shape, select the smooth cutout shape, check the Display detail boundary. This will give you an additional view with a box all the way around it and you can control the size of the box by dragging the detail view box over the base view.
Again not an ideal solution but it may save some time.