It will probaly be shorter and easier to assemble the sukkah than to understand the instructions. Also ascii text is not the most efficient for diagrams. Add what is applicable for siding. The following definitions are used. While they may be obvious it is probably best to make sure.
Diagonals are very important for the stability of the structure.
Also the direction of the diagonals ar chosen to ease set up. Draw diagonals on the square. The top hole will be for the posts on the left post as you look at a wall, the bottom hole will be for the right post. Take 2 4x4's and lay then paraelle 8 feet apart. Lay 3 8' 2x4s across them, one on the top, one in the middle, one on the bottom.