Center Square: 8.5 x 8.5 inches
Braids: 2 x 8.5 inches (cut 4 of each fabric for 1 run, 8 of each fabric for 2 runs..etc.)
Accent Squares: 2 x 2 inches ( you need two squares for each fabric used, so if you have 1 run of 9 fabrics, you need 18 accent squares. If you have 5 fabrics with 2 runs, you will end up with 10 braids on each side meaning you need 20 accent squares)
And just as a reminder, on my first post, the purple braid is a 5 fabric 2 run braid, the red one is an 11 fabric 1 run braid.
I generally put the top together before cutting the batting/backing and binding, just works better for me. Especially if you decide to pull out a fabric or put one in at the last minute.