Sketches and planning for my art installation

I've been roughing out the sculpture for my interactive display. As outlined in my proposal for my year one project, I'm creating a "Venus figure" based on Palaeolithic sculptures that I will be making interchangeable accessories for. The original figures are usually very small. Venus of Willendorf (the top image) is only 11.1 cm long. I've decide my sculpture will be 25 cm - it has to be big enough for me to drill holes at various spots for the pegs on my accessories to fit into, and I need all the accessories to be a size that is easy for people to handle. Once I get my armature finished, I will test that - make a few of my planned accessories out of polymer clay - to see if the scale will work. I can then scale up the figure if I need to - can't be too heavy or awkward to hold though. I did a few sketches to nail down a composite figure, and am now getting my armature made. Then I'll add clay and sculpt the details, such as they are, in. I was thinking ...