Install blocking 1-1/2" below the top of the frame along the sides of the deck at least 16" on center. You may be able to use scrap material for blocking.
Install 2x4 material on top of the blocking around the perimeter of the deck for a fastening surface for the picture frame decking and to end fasten the field decking boards.
Install the picture frame border with the desired overhang. In this case it is 2-1/4" because of the skirting and fascia boards that will be installed outside the frame below.
Notch the picture frame border around rail posts. Leave a 1/8" - 1/4" gap for composite decking to allow for thermal expansion. Wood picture frame decking can be notched flush with the post.
You may choose to continue the picture frame along the house wall. Notice the 45 degree miter cut in the corner. In this case we needed to cut down the last 2 deck boards in the field to prevent the last board being only 3/4" wide.