These are cut as equal sided diamond shape, So they are 2.5' side to side for both parallel sides. For this pattern, I'd sew groups of four rows together, press and then subcut diagonal sections, being very careful to keep my seams on the correct diagonal. Then I'd sew those sections together into rows and sew the rows together - no y seams at all for me! I do this the same as I'd do a bargello, just with the strips cut diagonal instead of square with the seams.