Thanks, Jan. Great idea!
Well, the grain runs east/west on the quilt panel front, (not sure why they print them this way, other than to utilize the largest print area of the panel as possible) so I placed the backing fabric north/south grain. I did add the twill tape and it seems to do a great job. I also did quite a bit of quilting, and it's to be a wall quilt, so the hanging sleeve will go full width and will most likely help with any possible stretching, too. I think it will be just fine.
Down to just the binding left to do...WOOT! WOOT!