The request for amendment shall be accompanied by a copy of the plan which shall show the layout of the total area to be included in the shopping center, which shall include, among other things, the information required below. If, however, portions of the project are to be completed in successive stages, a less detailed sketch or layout of the areas not scheduled for immediate development will suffice initially, provided that, as further development occurs, a plan showing all of the required detail shall then be submitted prior to the construction of any portion.