Here is our next block all laid out and ready to go. The bundle of squares at the top right are cut ready to turn into 1/2 square triangles for the corners.
Here is the block after the first round of piecing. I've done the 1/2 square triangles and have begun piecing the centre 16-patch and attaching the strips for the outer border.
When ever I do long strips they end up curving. So I decided to avoid that and do the centre square as four 4-patches. Here we are with the 4-patches assembled (and reduced to a larger 4-patch) and more work for the outer border.
Here is the centre assembled. The border strips are together as well. (And fortunately not too wonky :) Can you see that the block is now a 9-patch?