You should commence by assembling the frame. It is possible to do this by laying out the 2”x4” and ensuring that they are connected using the 6-inch straps. All the three holes located at each end of the straps must be used.
From there, the four-inch anchors must be attached to every 4×4 corner post with the help of two #8 x ¾” screws on every anchor. Accurately position the anchors on the adjacent sides. Two anchors should be placed on either end of the posts; do this on two sides at each end.
Place the base on an even surface, preferably on the ground where you need the stable to be positioned, and attach each corner post. Every end of the end pieces must have a corner post.
From there, you want to ensure that the posts are accurately secured to the base frame using the ideal screws. Each anchor should have two screws to achieve stability.
After you are certain that all corner posts are robustly attached to the base pieces, you can begin attaching the top frame pieces. Next, you want to install the sheathing boards to each side as well as the on rear of the frame.
You can do this using the #8 x 1-1/4” screws. Fetch a scrap measuring 2” x 4” and put it carefully across the base frame. This will provide adequate support to the sheathing board. By doing this, you will have enough space for electrical cords in case you will use any.
Once you are done with the first phase of constructing the nativity stable, you will be left with a frame box. If you notice that your frame sags at the right corner, you can fix that by putting a piece of 1” x 6” right below the front right corner.