It ended up 90" x 90"--a bit of a bear to wrangle while quilting, but it was all straight lines which helped.
There are several ways to lay out these blocks. (Note: Clicking the image will take you to the site on which it was originally posted.)
This one brings the blocks together in the centers and creates a central octagon secondary pattern.
This one alternates direction in every other row.
This one has sashing between the blocks which pulls the ties away from each other.
This one is set on point (diagonally placed blocks).
These two have carefully placed blocks to create an overall pattern.
I chose the classic layout, since I wanted the fabrics to be the focus. In the layout I chose, the printed blocks only come together at the points, rather than along the sides, serving to highlight the fabrics rather than the layout.