Step 2. Making the side walls

Construct the wall out of 75x50 (2"x3") treated, or natural decay-resistant, sawn lumber.

On an even surface construct two side walls to the dimensions as shown in the drawing.

Make the diagonal measurements equal (in the same way as with the base in step 1.) and when the walls are square, cut and fix the bracing members in place.

Stand the two side walls upright and temporarily prop in place, on top of the base. Fix the bottom plate of the side walls to the base boards with galvanized nails.