Thanks for the comments!
SBG, I winged it. Just make stuff up as I go along.
Jane Quilter, The center is 12 1/2" with 2 1/2" strips around it. So the strip blocks are 8 1/2". It must have finished at 48" square. (It's been a while since I made it...) It was a bit too big for the WOF of the flannel, so I had to piece the back. I suppose it would be more convenient to not go bigger than the WOF if you make it for a baby quilt. Strip blocks are easy enough to trim down to a smaller size-- unless you are concerned that all the strips are the same width.
Last edited by givio; 11-26-2017 at 08:11 PM.