For any project you should have a plan. For this specific project I planned for a structure with a base, a back side, and a basic roof that slants off to either side. the front would be completely open while the two sides would have a fence of some sort on it. Than at the two front corners their would be some sticks to help hold up the roof. Look at the drawing for more clarification and the measurements that I wanted, although you may want different measurements if your nativity pieces are of a different size or just for personal preference.