I used a Manimals Slythor figure as the base and lots of sculpting with Aves Apoxie Sculpt. It was tricky making the helmet and shell. I used various joints of the same size from my parts bin. Painted with testors model masters acrylics.
This was the hardest custom figure I've made, but the most fulfilling. Knowing that a real one of these sold for close to $21,00.00 on ebay a couple years ago, and that this is the closest i'll ever get to seeing one is really cool.