Here is the image split into three separate tones. If these were to be displayed as opaque materials, this is where I could stop. However using transparencies is going to mean some extra work.
Whereas Murphy can create quite solid back layers of lighter tones, I can't do that, as too many layers will result in darker colours. Therefore I need to look at it like so: The lightest tone needs to be made of one layer, the mid tone two layers and the darkest tone be made of three. Therefore I need to add to the two back layers. Which results in this.
When layered up these shapes should result in my desired image. I now need to concentrate on getting these made and projected, to see how this theory works in practice.