HI...a picture would help ... if your squares are sewn together, as i assume they are - could you put the backing and quilt top - wrong sides together - and stitch in the ditch around the squares close to the "ragged" edges to secure the back to the front ? As for the binding .....hmmm.....not sure but guess you could just do a regular binding...unless you've already snipped the edges....or if you can do the above...just snip the backing around the outer edge of the quilt ...????? again - i think a picture would help get you better answers than mine. GOOD LUCK !!