Sometimes there isn't enough money in the world to pay for the value of a job. I did something similar (repair an old quilt) which is a job I hate. It was made by a mother who had passed away and the daughter couldn't bear to part with it. It was in bad shape and I had to take it apart, resew and retie. Thank goodness it was tied and not quilted! I asked her to make a donation to my favourite charity and left it at that. If a price wasn't agreed upon before you started, it will be tricky to set a true value on all your work.