I made a wedding quilt similar to this a couple of years ago with 9 12" Ohio Star blocks. I framed each block to make them 15 1/2" (unfinished), sashed between and all around with 5" strips, then finished with 10" side borders and 15" top and bottom. The quilting was very simple - big zigzags edge to edge and I think it looked OK. Good enough for me to hand it over with pleasure anyway. The finished size was 85"x95". I'm sure your bil will appreciate your quilt anyway you finish it because you made it with love for them.