This will work but may sound confusing. Maybe you should draw a diagram. I only gave you a bit on each side, but you might be able to work out more once you see where I'm going. Cut two strips 101.5 inches the full width of fabric. This should leave you with one piece that is full width and 70" long. BTW, my method doesn't end up with everything going the same direction. Then cut this third piece the full 70" by 27". That leaves a 4th piece that is 70" by about 18". This one can be cut in two 35" by 18" pieces. Sew these two back together to form a 35" by about 35" square. That square should go onto the end of the third piece. That should give you 3 strips to sew together that are 101.5" wide (you'll have to trim the square to match) and will cover the 100" part. Got it?