Here is the final backrest for the U-shaped seating . . .
I keep making mistakes with the patterns though . . . This one has better than the curved settee backrest, but still not 100%. It seems that I am having a tough time making the color/channel/white combination from one side of the middle (white) strip to the other. In checking my dimensions after the fact on this piece, it looks like I made the channel panel on the 'stright' part of the backrest 1/4" bigger than it should have been. (6" instead of 5 3/4") . . .
just don't know how I did that since I carefully checked everything and knew that it should be 5 3/4" as that what I was using for all of the other backrests.
Anyway, not sure if there are any tricks to make sure the dimensions are the same . . . maybe just checking the cut pieces against the patterns and intended dimensions (maybe)?