Here is a better explanation of my suggestion. Since this is set on point, you will need to make the red-outlined extra blocks:
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- 5 extra snail trail blocks
- 2 extra large stars with white background
- 2 extra large stars with dark background
- 2 extra small stars (white background)
- 2 extra small stars (dark background)
- 1 dark setting square and 1 light setting square
- 4 setting triangles (for around the outside edges)
Continue the pattern on the left side of the quilt, inserting the extra blocks where the orange line is. You will have to switch the dark and light stars on the outer border to match the rest of the quilt - use the other sides as a guide for colour placement. This will make the finished quilt 93.5" square. If you want it bigger, I would add borders to get the finished size you want.
I hope this makes sense! Good luck, and post pictures. One of these years I'm going to tackle this quilt, and I love seeing other people's successes.