Unsatisfied with the outcome of the other scale sample for piece 6, I have decided to go back to it and work on a few of the problems.
The main problems for me were the shape and the smoothness of the exterior surface. I used a slightly deflated football this time as a mold. being slightly deflated meant that there was some movement which helped during the drying incase there was any shrinkage and it also aided the removal of the piece. It gave a much more satisfying uniform shape.