I haven't reworked someone else's quilt but I have finished someone else's UFO's. I finished 4 quilts of a friend's mother's when she passed away. They were late 70's early 80's quilts. She had started them, sandwiched them with high loft polyester (what was the style then), then tried to hand stitch part of two of them. I simply machine stitched the rest not taking out her own stitches. When I handed them over, I pointed out the hand stitches and told my friend that they were her mom's. She teared up. The ones without hand quilting, I simply replaced the batting with cotton and machine finished them. I felt good about it.