But then Lucy left me the perfect encouraging note in the comments and it gave me the motivation I needed to challenge myself to finish it in time for the big day.
So, instead of just reaching my goal of getting 3/4 of the top finish (quilting and assembly included), I managed to finish the top, choose and order the backing and binding, and pin-baste the quilt sandwich!
Don't you just love this backing fabric? It's Out N' About Green Highway Signs by Caleb Gray. I knew as soon as I spotted it at Fat Quarter Shop that I'd found the perfect complement to my traffic cone blocks.