Think I will concede, keep it simple and add the blocks as a row even though it speaks to me as a column.
I have 3 yds(108 in) of the backing fabric, cut at the 54 in. add the row of blocks and then add more yardage.
This quilt was one of my first, and I am replacing the backing, maybe best to get it right the second time.
Thanks everyone for your input!! JB