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Use a band saw to cut the plywood base. Cut 1/2" from one long side of the 12" x 6" piece of 3/4" plywood. Don't cut along the entire side: leave about 3" on one end to act as a hook for pushing wood through the saw (Image 1). Screw the first 12" x 2" strip of 3/4" plywood perpendicular to the second (Image 2).
Place the plywood base flush with the table saw's fence, on the side of the fence nearest to the blade. The end of the base with the 3" hook should be farthest from the blade.
Set the two strips of plywood on top of the fence, with the horizontal strip on top and the vertical strip hanging on the opposite side of the fence from the plywood base.
Use a pencil to draw a line where the top of the plywood strips meets the plywood base (Image 1). This indicates where the strips should be screwed onto the base. Screw the base and the strips together, starting the screws on the back side of the base (Image 2).
Drill holes for the carriage bolts on the two ends of the vertical strip of plywood. The carriage bolts and washers hold the jig in place on the fence (Image 1). Attach an oval piece of plywood to the top of the jig to act as a handle (Image 2).