For the 2nd block with the red centre & black corner triangles - could you also try making it with 4 half square triangles from the red & black fabric? Obviously you would not have the same design exactly as yours but it would achieve almost the same effect with the difference being the red centre would be not be quite the same as yours.
Love your quilt - just thought the half square triangles might be a simpler plan, for me, at least. Tk you for sharing this quilt - I think it presents such wonderful, creative ideas.