Build the base
Begin by cutting the top and bottom braces to size, noting the 55° bevels at each end. Make sure that 1/2" at the bottom corner of the bottom braces remains square, since pointed ends would soon break. Mark the middle of each part, then lay out the two 1 1/2"-wide notches you need to cut into each brace. The plans include the details you need to follow here. Clamp the braces in pairs as you work, notching the top edge of one pair and the bottom edge of another. The idea is to have alternating notches in the upper and lower brace pairs so they interlock, half-lap style.
Cut the legs to size and, on the outside top end of each one, make a notch three inches wide and 6 3/4"-long. Cut the feet to size, making 55° bevels at the outside corners, 1/2" up from the bottom edges.
Assembling the base is easiest if you've taken the care to get the joints correct. Use clamps, outdoor glue and #8 x 2 1/2" corrosionproof screws. Drive these into predrilled, counterbored screw holes. Start by laying one base support piece on your work surface, inside face up. Next, apply two legs to this base support, flush with the outside edges of the notches. The legs should be 4 1/2" apart. Then, attach a foot at each end of the brace, making sure that the top and bottom edges of the feet extend 1/2" above and below the edges of the bottom braces. Flip the assembly over and apply the second brace, sandwiching the legs and feet.
Next, stand the assembly upright and slip one opposite brace into the group, fitting the notches together. Apply screws from below to secure the pieces notch to notch, then add the other two legs and feet to the inside surface of this brace. Finally, tap the remaining brace in place, interlocking the notches and sandwiching the parts as before.
Join all four top braces together by fitting the notches at the centre. Use four screws to secure the braces in an X shape. Slide this assembly downward from the leg tops until the brace top edges are flush with the upper surface of the notches you cut in the legs. Measure, square up and clamp the top braces to the legs perfectly, then use #8 x 2 1/2" screws and outdoor glue to secure everything together.
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