It is true that most cathedral window quilts do not have borders. Could you do a facing finish on your quilt. You stated that it has to have some kind of finish because of the construction technique you used. To do a facing finish you would stitch on a strip of about two inches (could be more or less) on the edges and turn it to the back and slip stitch it in place. Your quilt is beautiful; I really like the strong colored fabric you used.