It had totally escaped me that nearly 2 months have gone by since I've done an update on my blanket project. Quite a lot has transpired during that time - some good, some not so much.
At the last update, I was just getting ready to start the last set of pieces (3 large blue). Talk about opening a can of worms! After completing the first piece I took it to do some measurements, and found that I was an inch short in each direction. At first I couldn't figure out what happened, but I finally realized that it was the ball of yarn that was the problem - when the individual strands were twisted together it was done too loosely, so my stitches were compacted more than any of the other balls of yarn I had used.
Not sure exactly what to do about it yet, I put that piece aside and started on the remaining 2 pieces. Having started a new ball of yarn (one that was manufactured properly), those ones worked up much better than the first. I was also very diligent about checking measurements often as I went along. Once those were finished, I decided to add some rows to the first piece and fix the height of it, but I still wasn't sure how I was going to add width without it looking stupid.
At that point, which was about 3 weeks ago, I had completed all 17 sections, and I figured it was a good time to set up a blocker board and lay out all of the pieces to see how they fit. The short answer to that question was "poorly". In total, 7 pieces were out of whack. Three of them I was able to leave as is, and 3 others were relatively easy to correct. The last one - well, that was the first blue piece with the bad yarn, and I knew that there was no way I was going to be happy with a band-aid fix. So off I went to get another ball of yarn, and I remade the whole thing (don't worry, the first piece isn't going to waste - it will eventually be used to make a matching pillow).
And that brings us to this morning. With all 17 pieces complete again, I set up the blocker board and laid everything out. Would you believe there was another piece that needed to be corrected? I don't know how I missed it the first time - it was clearly too wide overall, and even beyond that, my stitch tension was so bad that the left and right edges had noticeable curves in them. So guess what I started on this evening? Yup - making a new one. At least this time the yarn is OK, so I can simply pull the old piece apart as I work up the new one.
Here's a picture from this morning with all the pieces laid out...

The piece I'm working on replacing is the blue one near the top on the left edge. You can see how it's clearly wider than the pieces above and below it - almost touching the charcoal piece on its right.
The final step is going to be joining everything together. All of the gaps between the pieces will be filled in with strips of black stitching. How am I going to accomplish that you might ask? Well, the only thing I can say for certain at the moment is that it will involve a lot of swearing!
My original timeline for completion was the end of October, but with everything I needed to fix I'm about a month behind. Which isn't bad considering the scope of the project, and the fact that I'm basically making things up as I go.
When I get the first few pieces stitched together I'll be back with another update. =]