It is not so much of an addendum, more a completely different way of cutting and piecing the block. I tried to work out a way of subcutting larger pieces but couldn't get that to work and went back to basics.
I will put something together over the next few days as to how I did my block, but I am sure there are other ways to do this. If anyone else fancies working this out too, it would be nice to have a choice of methods.