Thanks for hanging in there with me, as sometimes online stuff takes a backseat to real life.
I just completed a handout for those who would like to read about fabric precuts, and also "how many blocks do I need?.... " Bed sizes anymore are suggestive only... LOTS of odd sizes out there!
Measure where you want the quilt to go, if you are aiming from a decorating standpoint. I would recommend keeping it 100 inches either way or less. Quilts that big are going to fit just fine on 108" backing, eliminating the need to piece your quilt back. Cost effective and will fit on the long arm frame just fine.