Well... there seems to be some problems with the sashing for the Cabin in the Cotton quilt on pages 43-48.
Using the formula on page 85, you get a sashing strip that is 25 1/2" long. However if you have cut your side setting triangles the full 8" as stated in the instructions for this quilt, you will have a quilt top that is not even at the outside edges.
My quilt was this way when it was completed because I then trimmed the quilt down so that the binding would be right at the edge of the corner of the sashing, meaning most of the fabric that hangs over on the side setting triangles is trimmed away.
This not being well explained has caused some issues, here are a couple of thoughts/ considerations for you to take into account.
First, if you know that you are not going to add another border to your quilt or don't want your blocks to "float" in the background, only add 2" to the measurement of the block to get the needed size for the side setting triangles... in the case of Cabin in the Cotton you would then be cutting 7" squares in half twice diagonally (see page 47, at the top).
If however having an uneven edge on your quilt makes you crazy, you can amend the formula on page 85 to read this way:
(Finished block size x number of blocks) + (cut sashing size x number of sashes) + 1/2"
By figuring using the cut size of the sashing, you add extra inches to the length of the sashing as well as the 1/2" for seam allowances, giving you more sashing length to play with and space for trimming.
I apologize for the confusion this may cause or have caused and hope this will help.