Are you absolutely certain you want to take the time and energy to restore this piece to where it is a usable bed quilt? Or might it be possible to maintain and work with the best parts of it to make it a nice wall hanging or frame it under glass with perhaps a photo of the maker, dates, family information, etc., (if it's a family heirloom). It sounds to me like you're going to put in a huge, huge amount of work to try to resore it and in the end not be quite satisfied with the result.