I don't know if this is helpful or not. I just looked up on point because I was not sure what it meant.
Here is a page for Math for On-Point Quilts.

http://www.quiltville.com/onpointmath.shtml

I really like your layout so far. After seeing your border & backing fabric I immediately thought that a narrow white piping would be great before the binding or in between the sashing.

thanks for the chart

I like your blocks, great job, I can't wait to see the finished top

Beautiful....

What you have done so far is awesome, your work is stunning. I would like to see a picture when it is finished.

I'm confused as to what's going in the middle blocks.
By the way, it is stunning!!!!!!!!!! :D

that is what I am stumped on. I had a plan but not going to do it. then thought about continuing the white from the middle into the side panels. but am worried about how that will look. then thought about just doing a couple of stripes. the solid blue fabric around a center stripe of the swirly blue fabric. than someone suggested adding a stripe of white between the blue stripes to help them pop. which I am thinking about doing. hope that this makes since. any suggestions will be helpful thanks everyone.

Hi from Florida.
I am not sure if this would work. I see that you have Octagon shapes in the centers of your blocks. Those have 8 flat sides. Maybe you could use a similar shape to connect the blocks using one of the flat sides. Without actually having the pieces I can't say that it would work. The quilt is beautiful.

I'm sorry I don't have a real suggestion, just an agreement with the PP who suggested a white between the blues to make them pop.

But WOW! I love what you've done so far. I love the colors, and I love the design.