So his Dad wants you to use up thrifted wool blankets? I would use two wool blankets the same size and put them together. Machine quilt them together in a large grid pattern or use yarn ties to put then together. Unless the edges are frayed, I would not even put binding on but just machine stitch the edges together. It will make a sturdy, warm utility car quilt and if washed, the whole thing will shrink at the same rate. Make one and see how it goes but I wouldn't waste a lovely cotton quilt top on this trial run.