Here is another way to do this and your rows will line up perfect...I call it the cheater method....put sashing on the right hand side of block, then sash the bottom of block and cover the sashing to the side...do this with all the squares...then when you assemble you line up like any other block! The trick is to remember the right side first and then the bottom....the bottom will be longer by the width of your sashing on the side! You then sash the top and left side when finished assembling and your top is complete except for additional borders...any questions you can PM me and I will answer as soon as possible!