I try to work on this a little each evening. Even a half hour helps to make a little progress. I filled in the rest of the red border and added the last border of black and white. Then I started the center section.
I still have a little of the largest border to fill in and a tiny section of brown in the center part that is completed. I’ll continue the center over the next week and also extend the largest border across the top and bottom. When that border is completed, I can slowly add the inner and outer borders. After all these years, it nice to see the halfway mark approaching.