I need your help determining how many panels I will need to order for a set of double doors that lead to the deck. The measurements of the frame around the doors is W 72" x H 84". I will need to be able to stack the panels back when the doors are being used because they are inswinging doors.

The panels I am thinking of ordering are from linens and things 'Majesty Plaid Window Curtains' they are 84"long and 42"wide. I will probably hang from rings and clips to get the proper length. They have free shipping on orders over $150.

Also how far will I need to extend the rod past the frame?