I've made several now--should finish up two more today using 4" blocks--I sewed the 4" squares together in rather large squares (8x8) just to use them up and put together a charity quilt. I followed the video that Leah Day has...
https://www.youtube.com/watch?v=v7_lwOfZWM8
Except that I think attaching the sashing the other way around is better as I prefer top stitching on the top and not from the back side.
Last week my daughter observed me hand stitching one and said, "Mom, wouldn't it be much faster to sew it on the machine?" When I told her, yes, but it isn't quite as accurate--unless you do it from the top."
So, I did...and it is working out great. I will be using this method more often for a change from quilting big pieces.