From Epic Cardboard Props:
How to make a Death Star with cardboard using easy tools that you will be proud to hang on your wall, or to give as a present for a birthday or for Christmas! In this DIY I teach you how to build a cardboard Death Star from Star Wars Return Of The Jedi, in an easy way and with almost nothing.
Interested in making this cardboard Death Star? The artist has the template right here ($1.99.)