how do you plan to quilt them? If on your machine, then you can pin or spray baste very carefully to line them up--if spray basting I'd suggest you first pin to get them lined up. If you are long arming, it 's going to be trickier cause of the rolling on the take-up roller. You will need to work with your LA quilter on this, but will likely need to add extra fabric on all 4 sides for LA quilter to clamp on and frankly, it may be about impossible to get it exactly lined up going top to bottom (or side to side if loaded that way).