The blocks the fall at the end of each row will NOT have the 1/2 sashing on the side that will be at the beginning and end of the row - same for the top of row one and the bottom of row 13. When all the rows are put together, then you add the 1/4" framing around the whole top - before adding the triangles. Does this help at all? Just FYI - I did find working with 1/2 strips to acquire 1/4 inch framing hard to work with so did make the framing larger, then cut it down.