not that many Unicron pieces. I have in the body, a unicron piece, front of the shell.
Gundam wings on the shell.
Megatron barrels connected to Darth Vader world shell.
Ultra magnus feet pieces to join the shell to the barrels.
Joints are using Bionicles and some lego pieces for hands joints
and finally, the feet, thats using a Dinosaur set found in target. Its made from hard plastic.