I agree with the other posts. Your price is very generous. I also agree that if the top is in good shape, just clip (if you can) the ties and pitch the batting and backing (if your customer agrees), re-sandwich with new batting and backing and tie it again and bind it. If you do it this way, be sure to take into acount the cost of the new material. With your customers approval, you might even be able to trim the binding off and not pick it out. So much of this depends on the shape of the top and what the customer's expectations are.
If the top is pretty beaten up, I'd also consider going the tulle route.
Whatever direction you decide to go, be sure your customer is aware of what the fix is and what your steps are to do the repair.
Good luck with this.