Your quilt is awesome. I think you done a fantastic job on it. I always square up my blocks again after I quilt them. They will sometimes get wonky on you. Then add the sashing between them to make into rows. When I want to sash the rows together, I add the sashing to one side & then I lay one row on top of the first row, tops facing each other & aline it to the sashing. Then I fold down the top row just past the sashing & line the sashing that is between the blocks up & pin then fold back down & sew. Never had trouble with them lining up this way. Hope I explained it okay.