Hi Dan,

I believe Michael have a plan like "flatten surface" in Rhino in the feature.
But today you have to use another program to help you.
One of them is : www.tamasoft.co.jp/pepakura-en/

As I know there are another software that also can do that, but I forgot the name :(

EDIT : Here it is http://www.laminadesign.com

Good Luck !