I literally made this out of garbage. Bubble foam is not really ideal to work with. I used the sideshow throne pictures as a reference and estimated the shape. It's made out of five core pieces glued together. I then used wood filler and many coats of plaster to fill in all the holes get the shape to my liking. I have yet to figure out the base. I'll be adding buttons and seat cushions next. Probably a matte coat too.
Couldn't fit all the pics in one post so bear with me.