I think all is fair in love and quilting! Example - A good friend had made the 12" blocks for a rather large throw quilt for her sun porch. When it got to cutting and adding the sashing and borders, she was stymied. She had never done anything bigger than a wall hanging or baby quilt before, and the measurements of all that bigger stuff were scaring her.
We cut a deal - I added the sashing, three borders, and binding (after I took it to a long-arm quilter) to her quilt, and she gave me fabric from her stash. We saw it as a win-win. My stash was meager, her quilt is done.
Do whatever makes you happy with this quilt. If the police come, tell them to go away!!