trying to keep it equal.

I used a polystyrene ball which I then covered with milliput to make a solid surface to sculpt onto. I dusted the milliput with toulk powder to stop it sticking to the rolling pin. I then added the side flaps out of styrene. I scraped my scalpel into the milliput to make the sculpy stick to the milliput. I then kept sculpting and measuring to keep it symmetrical. I took photo's of it a couple of times to compare the symmetry from a different perspective. As the camera flattened the image some times mistakes are easier to spot in this way.