For long yardage, simply cut borders for each layer to match the first measurement, then sandwich and sew them to the top and sides. Repeat for the remaining ends.
If you're piecing long borders from crosswise grain fabrics, measure and piece each layer first, and then sandwich and add them to the quilt.
If you're using 5" squares, sew the sandwiched squares for the left and right sides together (11 sandwich groups for each) and then add them to the quilt. Repeat for the top and bottom (12 sandwich groups for each).
After the borders are in place, Sew a double seam around the entire quilt about 1/2" from the edges.