Your pin wheels look great. I love the 30s fabric.
I made a 9-patch quilt using similar fabrics. I added a thin white border and a scrappy border and a wider white border. If you would like to see I have it posted here. It might give you an idea of what your plans might look like.
http://www.quiltingboard.com/t-72839-1.htm
I think your proportions are right on.