Sometimes there's an easier, more efficient way to do things. When I look at a pattern I plan things out before I cut out my paper pattern pieces because cutting out each piece individually is not always the best way to handle a situation. If you are striving for accuracy you sometimes have to work somewhat backwards.
Here's a good case in point. If I were making the pattern on the left below I wouldn't cut out all of those circular bubbles. I'd trace out the pattern but I'd omit the bubbles and connect the lines that run between them as you see on the right.
Next, cut and grind the pieces as if the bubbles aren't in the pattern as you see on the bottom left. Then trace out your round bubbles and then cut, grind and wrap all of them. Place them on the glass that you have already ground and carefully trace around all of them with your marker. Cut as much of the circles as you feel safe in doing and then grind the rest of the circular openings. Since none of the bubbles that you cut will be identical, you'll need to be sure to place each bubble back into its original location where you traced it. When you're finished grinding all of these half circles you'll have a background that perfectly fits your bubbles.
With all of the pieces cut and ground for her 8th window MiMi is ready to begin wrapping this one. She says that these smaller doors are going considerably faster than the larger ones and that's got to make MiMi feel good knowing that the end is getting closer and closer and faster and faster.