So this was many years ago and based on Optimus Prime; a robot that transforms out of a lasagne package and back. Two years later I tried to make one out of a real sheep skull, but failed. It started with many pieces of skull:
Eventually, the project failed on joints that kept breaking away from the bone, but the last few days I spend some time, not too much, with my old first generation Transformers and this idea is getting very tempting again! So 2015 might see a Transformer that transforms out of a real sheep skull, but it is going to be a frustrating journey without doubt!