at least your's is with a complex block! Yesterday I was barreling along on a simple floating star in a box (so it's self sashed) and so proud that I had 3 blocks finished (last Sat.) and the other 17 all ready for the self-sashing--and realized when I'd trimmed them down I cut to 9" sq instead of 9.5"! Had to take apart the 3 finished ones and cut them down too--it's just going to be a bit smaller!