There is a lesson to be learned in this situation- have the terms and conditions agreed to and written down beforehand. One fact is obvious to me. you didn't know what you were going to be up against before you started on this project so you would not have been prepared to state a really fair price. Your quilting is beautiful. However, this time you made need to accept less than some of the board members think you should charge because you were inexperienced. I did drapery fabrication for a number of years and in the early days I endured less profit for time spent because of inexperience in pricing as opposed to inability to produce a quality product. Good luck as you talk to your customer and I hope you reach a mutually acceptable price.