There's no reason not to continue as you have been. Just do each "column" of blocks with sashing top, bottom and on left side. It'll work...and your blocks look great!! I don't see any issues worth tearing it all apart!!

i don't see anything wrong with it...looks great...

I think it looks great too...why redo it? It all blends nicely

This is a wonderful boy quilt. Just bite the bullet and 'unsew', you will love it when it is finished.

Why can't you sash as you go? It looks great. Love the colors, too.

Well, I certainly like what you showed us! It's very cute & great idea!!

I don't get the problem.
I love it!

Looks great. Finish it and don't worry yourself.

Why can't you continue sashing as you are going? Looks good to me.

why do you hate the sashing? i think it looks great!