Last weekend I went to my batch to put some insulation and jib into my cabin. When putting the insulation in the walls I had to cut them a little bigger than the space so that the insulation can stay in the wall. When I was putting the jib onto the wall I had to measure the size that we needed and then I put to marks and cut from mark to mark with a 1800mm straight edge than I held it agaist the wall and screwed it on with a screw gun. I then used GIB stopping to fill the joins of the walls and sand them down to make the wall smooth for paint.