Those are all good thing to do Capt. and you have to pay attention. I have a jig for the supers, I just did the inside and out side on three sides. You didn't need the other end if you did the super from the correct end. Last winter when I started putting together some super I noticed after a couple the weren't sitting level. I put the jig down on table 180 degrees off, turned it around. Just enough to keep it from sitting level when put together. Probably should go ahead and square the other end also.