I just finished sewing the strips together and have two cautions. After sewing the strips together into one very long piece, do not roll them up but just lay or toss them in a bag. I tried rolling mine and it twisted or curled like yarn does.
Next, when sewing the ends together to make 2's 4's.etc. make sure not to twist the strips. At one end I had a twist and had to cut part of it off and resew it. For those who knit in the round it is similar to not having all stitches going the same direction when doing the join and first row after cast-on.