Step 8: Brace the legs and trim the jut-outs.
Cut two braces from (18mm) thick plywood.
Make the tops of the two braces 7 3/8" (190mm) long.
Mark the sides running out 20° off square, then cut. See top-right picture.
Fit each brace at the top of the legs hard up to the underside of the sawhorse top.
Fix the braces to the legs with three galvanized flat-head nails 2 1/2" (60mm) long each side.
Finally, lay the sawhorse on its side and cut off the tops of the legs protruding past the sawhorse top.