I was part of a Row Robin last year and each pieced row I got back was a different length, even tho we had decided at the start they should be a certain width and length. One row was 2.25" shorter than the others! I resewed the seams that joined the blocks together on some, then ripped out the original seams. Even changing 1/8" makes a big change over the course of 6 blocks. One strip was not made with rectangular blocks, however. Also it had a light background, which none of the other blocks had and it looked so out of place with all the rest of the rows. I ended up putting that row on the back. I thought at the beginning this would be such a fun project, but in the end was quite frustrating. After all the questions and frustrations, I am happy with the end result though. Good Luck with whatever you decide to do.