OK, I see how this might have been confusing.
It was my intent that the sizes of the center and each border are to be as laid out in the directions.
So everyone will end up with the same size quilt - 90 inches.
The reason I did it this way is that there are some beginners in the group and the rounds are even multiples.
In other words, round 2 can have (10) 3 inch blocks
round 3, (7) 6 inch blocks
round 4, (8) 7 inch blocks
round 5, (9) 8 inch blocks
round 6 (10) 9 inch blocks
You dont have to make blocks for your borders, but if you do, they will fit evenly.
Sorry for any confusion.