Are you wondering what this is going to look like in real fabric. I have actually started to sew some so that we have a real example.
Once you have cut your strips and sewn them together you will have something like this.
Note that because I am using my pink scraps, I have pieces that are not width of fabric. I go ahead and sew them to width of fabric pieces and when one runs out, just start at that point with the next. I don't worry now about measuring.
These strip sets should be measuring 3½ inches wide. If any are way off, check our quarter inch seams. If they are all off but by the same amount, well, adjust. You can make other units the same size.
(Teaching beginning quilters, the rail fence is a good starter block. It is simple, and if they go together the wrong width, we cut them the width that they are into squares. The learners learn the importance of the quarter inch seam allowance, but also the value of adapting along the way instead of giving up.)
Oh, in case you didn't figure it out, these strips are being cut into rail fence units. If your seams are accurate and the strips are 3½ inches wide, then cut them into 3½ inch squares. (Whatever the width, they are cut into squares the same width as the strip sets. If you need to adjust, let me know and I will help with the arithmetic later. I am awake now and can actually count, add, and subtract.)
You see some scrap ends and miss-cuts below. If they are like those on the left, save them for another step later. Those bits on the right I will toss.