first....take lots of pix of the quilt as it exists now...this is for the last step. the info you have sounds great, the only thing that i would add is that occasionally, i have taken off the last row, either across or all around, and then used the good parts of those blocks to repair the bad parts in the center. i will say, take off a bit more than you need to right now...there will be other repairs in the future. this has the advantage of all the materials being original...and you should have plenty to fix center squares and do any repair to the backing... the binding might need to be replaced, but you might have enough backing to re-bind with that after taking off the outside row....any new fabrics give the whole quilt a new age...always the 'newest' fabric in the quilt. then after finished, document everything you did including any information you have about the maker, full name, approx date of quilt, any helpers, her relationship to you, and keep this info with the quilt (a pocket on the back is nice.)