What size is the quilt top right now (before borders)? I have to ask -- I'm just in awe looking at it!
Must admit, though - if it were me, I'd probably do some piecing so you hit the 10,000 mark in pieces, just to be able to say you'd done it. This is one of those 'once in a lifetime' quilts that will be passed on to future generations, and its absolutely amazing!