Pendleton wool is beautiful and if it is lightweight, I would use flannel on the back. 36 x 36 or 45 x 45 is a nice size for a lap quilt. Take a piece of fabric that size and lay it over your knees, does it cover well or would you like it bigger? For someone in a wheelchair I would sew right sides together, for someone who is ambulatory like yourself, a fringe of wool yarn or a binding would be very nice. Lucky the person who gets this and I hope they don't put it in the washing machine. Be sure to mark it 100% wool. Dry clean only.
Carol J.