To make LEGO Luke's lightsaber easier to build out of paper, I've divided it into several different, separate easy to build parts.
Although making it as one big hollow shell would make the "polycount" (the number of pieces in the 3D model) much lower, that's often not the best option when you're only making the 3D model as a tool to make a papercraft model! ;o)
See my papercraft weblog for more "Works In Progress":
[link]
I don't know which models I'll make in the future (I have so many ideas really....), but Paper Inside made the classic Batmobile from the old TV series and the Tumblr from the new movies already: [link] (and lots more ;o)
And Dave made some very simple versions of the Keaton Car and the Tumblr here: [link] (and lots more ;o)
And maybe you can find even more papercraft Batmobiles online! ;o)