I don't know what size the original poster made her blocks and photos don't always tell you. This block would work very nicely with 2 1/2" strips. Cut the large square 6 1/2", cut a 2 1/2" orange and a navy square, one 2 1/2" x 6 1/2" navy strip, two 2 1/2" x 6 1/2" orange strips and one 2 1/2" x 10 1/2" navy strip to have a 10 1/2" block (10" finished). Use 2 1/2" sashing between the blocks.