I haven't been on in awhile and boy did I get a shock on this forum..Thought I had posted guess I didn't I love learning new stuff.. You can probably Tweak your blocks..Which is give or take a little on each side at the points where each block meets..I did this with an ATTIC quilt..It works..you only rip out a little at the top or bottom or both top and bottom ..Hard to tell if it is off a little as long as your points meet. LOL!!! I am sending you a link of the attic quilt I made and believe me 75% of this quilt was tweaked... The Blocks should be 6 by 6 with 2 inch sashes..NOT!! in places but you cant tell unless you measure each block... Don't get discouraged..I have learned going SLOW when the 1/4 inch is important is the best way...Good Luck..I don't use the walking foot for this..Just make sure the foot is a 1/4 inch foot and go slowly..This is the Link...
http://www.quiltingboard.com/picture...ed-t23156.html